In before "dont buy this car if you care about gas" whatever.


Point of this thread is that it seems that the EVO X is getting significantly better MPG then the IX. I've been torn for awhile as to whether to get a IX or X (East coast is really a pain for buying an X, everyone wants MSRP or marked up prices)

obviously i've weighed the pros and cons of both, but something i'm just starting to consider as gas prices inch up closer to $5 is that people are getting some really good mpg out of the X for a sports car.

I imagine with a real tune, and basic bolts ons a steady 23-25mpg seems pretty achievable? Compared to the 18-21 mpg with the IX?

This is also interesting to me considering the X is considerably heavier then the IX.. I guess its the efficiency of the engine? Aerodynamics? Has anyone figured this out?

 

Simple bolt ons, tune and a nice portion of highway driving and 23mpg is almost guarenteed. heck you can get 23mpg stock if you pu$$y foot it and stay out of boost.

Some are reporting 27mpg with bolt on and highway driving.

 

I got 25.7mpg with about 75% highway, and 25% stop and go this past weekend. I don't drive slow either.

 

Damn, thats pretty good. Have you gotten the 2nd reflash yet?

 

What are you guys getting city driving though?

 

Actually after the reflash and installing my air intake, I averaged 30mpg on my highway commute (roughly 40miles). I was shocked! Around the city I can average anywhere from 13mpg to 22 depending on how I drive.

 

the really good highway mileage mpg.

 

ouchhh 13mpg. Most of my driving here is NJ city, which means there is a stop sign or red light every 5 minutes or less. I currently get around 22mpg city in my current car.

 

The X does not get better fuel economy than the IX. Its heavier and the same displacement. The one thing the X has going for it is the fuel consumption gauge that gives real time feedback. This, a conversation with Darryl at Ultimate Racing, and the price of gas have turned me on to hypermiling. I bet I could get 27 or 28mpg out of a tuned IX with a turbo-back. I bet I could (have) get 30 from an VIII.

 

Same displacement doesn't neccesarily mean same mpg, and a heavier car with the same displacement engine (read: not SAME engine) won't neccesarily get worse mpg either.


Look at cars like lexus is300 with 6 cylinders that get NO gas mileage.

Then look at cars like Corvette c5's that have big v8s and get great gas mileage.


The IX and X have two completely different engines, and engines vary WIDELY in efficiency.

As such, it's completely plausible that the X could get better gas mileage or vice versa. From what i've read here over the years it looks like right off the bat people are averaging better mpg in the X, and there is minimal aftermarket at this point and tuning has only just begun. This is compared to the many, many years of previous generation evos tuning and aftermarket as well.

 

That means only a little. I know of several cars that got heavier with the same exact displacement and got better mileage than their previous generations did.

 

evo x has better gas mileage huh. I think i'm doing 22 mpg on mine..not sure though

 

What? Im sorry but I am going to have to disagree with that. There is no way you could get 30mpg out of a VIII, nor 28mpg out of a IX. Ive been doing "hypermilling" for a long time, and while it does help consumption, there are most def limits of it, and the figures you said are not in the limits of the 4g63 or the evo.

 

I have a hard time getting 200 miles to the tank, even after a factory reflash.

 

The X final drive is also slightly shorter than the IX.

Gearing.

Also gearing. Those loaf just beyond idle RPM when cruising in sixth gear

My IX and X (with flash+TBE on both) were similar in both power output and fuel consumption.

The things that work big in favor of the X:
-They can be are driven for fuel economy by closely monitoring the fuel computer, which will make your adapt your right foot to stop wasting gas if you pay attention.
-Cruise control. It makes for a boring drive, but you can return great fuel economy if you use it correctly.


First, its hypermiling, not hypermilling.

Second, you're basically calling my a liar and need to quit. My VIII got just over 30mpg on the highway the few times I wanted it to. It also got the best fuel economy when it had the most mods: 3071R, cam gears, cams, tune, etc.

Stock, it did not get anywhere near that. At 70mph, it would not even spool the 30R going uphill with the cam gears set at -3/-2. Use light throttle inputs, stay at 70mph max, take plenty of time to pass, don't boost, and take the car out of gear on extreme downhill sections and let the car coast up to 80+, rev match just above the speed limit, and re-engage gear. That's how you get great fuel economy in a manual FI car. When I would go down to the shop, I would drive like a grandma so I could tune on my state's gas instead of the shop's state's gas. Those were the times I hit 30mpg. In the night, light traffic, stable driving.

Assuming all 5 speed manual Evos, here are the engine speeds in fifth gear at 70mph:

Evo X: 3300rpm
Evo IX: 3200rpm
Evo VIII: 3000rpm

In rush hour traffic, there is no way you can return 27.5mpg in a tuned X. But you can do it in light traffic if you purposely try. That's the whole point of my posts on this topic.