Strange stutter at about 2600 rpm in 5th....
We are making a great first impression. /snark
Some poor Canadian just needs to be told about CBV "flutter" on partial lifts and here we are having a war about the best cruising RPM for gas-mileage.
Oh, well. What would an internet thread be without semi-OT arguing. Can I save us a few steps by mentioning right now that neither Hitler nor Grumpy Cat nor McKayla Maroney cares about or is impressed by gas mileage?
Some poor Canadian just needs to be told about CBV "flutter" on partial lifts and here we are having a war about the best cruising RPM for gas-mileage.
Oh, well. What would an internet thread be without semi-OT arguing. Can I save us a few steps by mentioning right now that neither Hitler nor Grumpy Cat nor McKayla Maroney cares about or is impressed by gas mileage?
Thread Starter
Newbie
Joined: Apr 2013
Posts: 2
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From: Alberta, Canada
Hahahaha... well I took a bit longer to get back to this than I would have liked, but I definitely didn't expect this kind of response :P.
Either way, I do appreciate your guys' input. I did suspect that it had to do with the bypass valve or boost control system in some way, so thank you Iowa for confirming.
And just to be clear, I am fully aware of the physics behind how our powertrains operate; I do not regularly drive around at low RPMs in 5th, I definitely do not floor the throttle under these conditions, and I understand that there can be a lot of excessive loading sustained under these conditions. This was more of a curiosity thing. I have just a couple roads around my place that put me in that awkward speed range, and normally I do resort to just rolling around in 4th at those times.
On the separate sub-topic that has been established here, you guys figure around 3200 rpm does yield the best mileage? Is that a relative consensus? I've always wondered about that too, but haven't had the patience to test it out myself :P I find 3800 a bit hard to believe.
Either way, I do appreciate your guys' input. I did suspect that it had to do with the bypass valve or boost control system in some way, so thank you Iowa for confirming.
And just to be clear, I am fully aware of the physics behind how our powertrains operate; I do not regularly drive around at low RPMs in 5th, I definitely do not floor the throttle under these conditions, and I understand that there can be a lot of excessive loading sustained under these conditions. This was more of a curiosity thing. I have just a couple roads around my place that put me in that awkward speed range, and normally I do resort to just rolling around in 4th at those times.
On the separate sub-topic that has been established here, you guys figure around 3200 rpm does yield the best mileage? Is that a relative consensus? I've always wondered about that too, but haven't had the patience to test it out myself :P I find 3800 a bit hard to believe.
Hahahaha... well I took a bit longer to get back to this than I would have liked, but I definitely didn't expect this kind of response :P.
Either way, I do appreciate your guys' input. I did suspect that it had to do with the bypass valve or boost control system in some way, so thank you Iowa for confirming.
And just to be clear, I am fully aware of the physics behind how our powertrains operate; I do not regularly drive around at low RPMs in 5th, I definitely do not floor the throttle under these conditions, and I understand that there can be a lot of excessive loading sustained under these conditions. This was more of a curiosity thing. I have just a couple roads around my place that put me in that awkward speed range, and normally I do resort to just rolling around in 4th at those times.
On the separate sub-topic that has been established here, you guys figure around 3200 rpm does yield the best mileage? Is that a relative consensus? I've always wondered about that too, but haven't had the patience to test it out myself :P I find 3800 a bit hard to believe.
Either way, I do appreciate your guys' input. I did suspect that it had to do with the bypass valve or boost control system in some way, so thank you Iowa for confirming.
And just to be clear, I am fully aware of the physics behind how our powertrains operate; I do not regularly drive around at low RPMs in 5th, I definitely do not floor the throttle under these conditions, and I understand that there can be a lot of excessive loading sustained under these conditions. This was more of a curiosity thing. I have just a couple roads around my place that put me in that awkward speed range, and normally I do resort to just rolling around in 4th at those times.
On the separate sub-topic that has been established here, you guys figure around 3200 rpm does yield the best mileage? Is that a relative consensus? I've always wondered about that too, but haven't had the patience to test it out myself :P I find 3800 a bit hard to believe.
On stock turbo, that's where it landed me. Now that I have a big turbo, and it doesn't spool until later, I can stay a bit higher in RPMs without a huge drop in mileage.
Hahahaha... well I took a bit longer to get back to this than I would have liked, but I definitely didn't expect this kind of response :P.
Either way, I do appreciate your guys' input. I did suspect that it had to do with the bypass valve or boost control system in some way, so thank you Iowa for confirming.
And just to be clear, I am fully aware of the physics behind how our powertrains operate; I do not regularly drive around at low RPMs in 5th, I definitely do not floor the throttle under these conditions, and I understand that there can be a lot of excessive loading sustained under these conditions. This was more of a curiosity thing. I have just a couple roads around my place that put me in that awkward speed range, and normally I do resort to just rolling around in 4th at those times.
On the separate sub-topic that has been established here, you guys figure around 3200 rpm does yield the best mileage? Is that a relative consensus? I've always wondered about that too, but haven't had the patience to test it out myself :P I find 3800 a bit hard to believe.
Either way, I do appreciate your guys' input. I did suspect that it had to do with the bypass valve or boost control system in some way, so thank you Iowa for confirming.
And just to be clear, I am fully aware of the physics behind how our powertrains operate; I do not regularly drive around at low RPMs in 5th, I definitely do not floor the throttle under these conditions, and I understand that there can be a lot of excessive loading sustained under these conditions. This was more of a curiosity thing. I have just a couple roads around my place that put me in that awkward speed range, and normally I do resort to just rolling around in 4th at those times.
On the separate sub-topic that has been established here, you guys figure around 3200 rpm does yield the best mileage? Is that a relative consensus? I've always wondered about that too, but haven't had the patience to test it out myself :P I find 3800 a bit hard to believe.
There's no simple answer to the question of what RPM provides the best mileage because it depends on too many other things, such as the power curve for the engine and how much power is needed to maintain speed.
As to mileage as a function of speed, no car that has been tested has ever gotten peak mileage at a speed above 50 MPH. There may be some small local minima and maxima above 50, and these may be due to RPM for all I know, but there is always a better speed for mileage below 50 MPH than any speed above 50 MPH. It's a popular but many-times-debunked myth that "my car gets its best mileage at X MPH" where X is anything above 50. Wind resistance rules.
As to mileage as a function of speed, no car that has been tested has ever gotten peak mileage at a speed above 50 MPH. There may be some small local minima and maxima above 50, and these may be due to RPM for all I know, but there is always a better speed for mileage below 50 MPH than any speed above 50 MPH. It's a popular but many-times-debunked myth that "my car gets its best mileage at X MPH" where X is anything above 50. Wind resistance rules.
The highways around me have a 75mph limit and I've found that setting the cruise control right around 80-81 gets me about 23mpg on long trips. From what I remember this is around the 3800rpm range. A little faster or a little slower and my mpg drops to around 21 for whatever reason. It's not safe to go 60-65 when the limit is 75 so I've never tested slower speeds/lower rpms.
I would be pissed if I only got 23 mpg, lol.
Aren't Evo's only rated at 22mpg highway? Or something close to that.
There's no simple answer to the question of what RPM provides the best mileage because it depends on too many other things, such as the power curve for the engine and how much power is needed to maintain speed.
As to mileage as a function of speed, no car that has been tested has ever gotten peak mileage at a speed above 50 MPH. There may be some small local minima and maxima above 50, and these may be due to RPM for all I know, but there is always a better speed for mileage below 50 MPH than any speed above 50 MPH. It's a popular but many-times-debunked myth that "my car gets its best mileage at X MPH" where X is anything above 50. Wind resistance rules.
As to mileage as a function of speed, no car that has been tested has ever gotten peak mileage at a speed above 50 MPH. There may be some small local minima and maxima above 50, and these may be due to RPM for all I know, but there is always a better speed for mileage below 50 MPH than any speed above 50 MPH. It's a popular but many-times-debunked myth that "my car gets its best mileage at X MPH" where X is anything above 50. Wind resistance rules.
Not sure how you're managing 28. Are you actually calculating it by dividing your miles driven by the number of gallons you fill up or just using the display in the console? I'd LOVE to see you drive from Santa Fe to Las Cruces and only use 10 gallons of gas.
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Joined: Jun 2013
Posts: 17
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From: Knoxville, TN
yeah seriously using the display is for tracking your avg. mpg as you drive but in order to track your actual mpg on a tank you need to log the miles and gallons at fill up. Unless you are hyper-mileing in your evo (driving like grandma) or always drive down hill.
Several cars with low CoDs and low frontal areas have been tested. But, as I said, no car that's been tested has ever had a peak-mileage speed above 50 MPH. The "my car gets its best mileage at X MPH" where X is greater than 50 is a myth.
Newbie
Joined: Oct 2012
Posts: 15
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From: Wallingford, CT
I can get this flutter in any gear. It is what it is.
Not to be outdone with off topic fuel mileage comments:
I once got 11.5 mpg. On a fillup of 12 gallons. On 93 octane (10% ethonol). On the street! You have to work it to get 11.5 on the street.
The only way I could exceed 23 is to snag a grappling hook on the back of an 18 wheeler.
Mark
Not to be outdone with off topic fuel mileage comments:
I once got 11.5 mpg. On a fillup of 12 gallons. On 93 octane (10% ethonol). On the street! You have to work it to get 11.5 on the street.
The only way I could exceed 23 is to snag a grappling hook on the back of an 18 wheeler.
Mark
Yeah only using the display for info. I have gotten 30 mpg from Santa Fe to ABQ (1500ft drop), but I have also done 30 from Santa Fe to Los Alamos. Used to get 27-29 cruising from Chatsworth to Santa Fe springs (RRE) in LA (that's 405 and 5 in traffic).
Not sure how you drive like a grandpa when cruising 80 mph on the highway. I just stay at a consistent speed and not spool up next to every car I pass, ricer flyby lol.
In reality if the turbo doesn't spool you cruising in a 2.0L 4 cyl car that should get good mpg.
I have fun in my car but I don't drive like a 17 year old.
Also aftermarket turbo will help mpg in my opinion, since it spools a bit later and you would be in boost less.
Also 22mpg is stock rating with pig rich tune, ala why is my exhaust pipes tips black? That's cause you ain't burning up your fuel. My stock evo in 08 had fuel smell in the oil when you checked it. Can't speak on factory tune on 2010-current though. Never taken a highway trip and gotten less than 25 mpg. I do run Amsoil and currently redline, not sure if that helps over mobil 1, but I doubt it.
Not sure how you drive like a grandpa when cruising 80 mph on the highway. I just stay at a consistent speed and not spool up next to every car I pass, ricer flyby lol.
In reality if the turbo doesn't spool you cruising in a 2.0L 4 cyl car that should get good mpg.
I have fun in my car but I don't drive like a 17 year old.
Also aftermarket turbo will help mpg in my opinion, since it spools a bit later and you would be in boost less.
Also 22mpg is stock rating with pig rich tune, ala why is my exhaust pipes tips black? That's cause you ain't burning up your fuel. My stock evo in 08 had fuel smell in the oil when you checked it. Can't speak on factory tune on 2010-current though. Never taken a highway trip and gotten less than 25 mpg. I do run Amsoil and currently redline, not sure if that helps over mobil 1, but I doubt it.
The highways around me have a 75mph limit and I've found that setting the cruise control right around 80-81 gets me about 23mpg on long trips. From what I remember this is around the 3800rpm range. A little faster or a little slower and my mpg drops to around 21 for whatever reason. It's not safe to go 60-65 when the limit is 75 so I've never tested slower speeds/lower rpms.
Ultimate fuel economy in the Evo is 55mph in 5th gear, or around 2600rpm, where you don't think we should be. You can get 27mpg that way.
I drive on an interstate near 80mph too, but I get infinitely better fuel economy on roads where the speed limit is 55. The stock DV is definitely more flutter prone in that range, but it's easy to sustain without it. It'd be a huge waste to cruise in 4th at that speed.
Mod fight!
I really doubt that a car with the CoD and frontal area of an Evo X gets better mileage at 55 MPH than something closer to whatever speed we go at about 2600 RPM in 4th (assuming a GSR). As I've said way too many times already, no car that's been tested gets peak mileage at a speed over 50 MPH.
Remember, drag goes up with the square of speed. That's the main reason why speed kills (gas mileage).
With that said, if you actually drive at 45 MPH on the highway, you will be rear-ended or ticketed, so I'm not actually suggesting that you do this. But this is the internet, where arguments over improbable hypotheticals always win.
I really doubt that a car with the CoD and frontal area of an Evo X gets better mileage at 55 MPH than something closer to whatever speed we go at about 2600 RPM in 4th (assuming a GSR). As I've said way too many times already, no car that's been tested gets peak mileage at a speed over 50 MPH.
Remember, drag goes up with the square of speed. That's the main reason why speed kills (gas mileage).
With that said, if you actually drive at 45 MPH on the highway, you will be rear-ended or ticketed, so I'm not actually suggesting that you do this. But this is the internet, where arguments over improbable hypotheticals always win.