Doing the math gives 105 miles a tank which is horrible, should be at least double that. My personal Evo that runs E85 24/7 365 averages over 100 miles with just half a tank.



- Bryan

 

I haven't calculated gas mileage exactly yet, but I'm about with Bryan. I took a 100 mile road trip twice in consecutive days and still had somewhere between 1/8 and 1/4 tank (can't remember exactly now). Obviously over 200 miles a tank though.

 

it all depend on how you drive the car,and either highway or local.

 

105 to a tank is still only around 8mpg. Horrible no matter how you drive it on the street. Either your approximation of your miles run is off or something is wrong with the car.

Even straight Ethanol would have better mpg

- bryan

 

well, a dodge viper got 400hp with only 10mpg. I pretty much floor my car all the time, 8mpg seem ok. And if something is wrong with car, it wont make 460hp and 30psi boost . and a good tuned of 12.0 afr. Please reconsider before reply.

 

We have guys running E85 with 450whp to 600whp that get better than 8mpg. 14+ mpg to be more exact.

WOT is not the only place you have to tune a car properly.

Please reconsider that your car is not the only Evo running E85 and therefore not the shining pillar of truth you think it might be.

Either way, enjoy your car.

- Bryan

 

well my friend, all the people u know average more than 8mpg, but not me. We out here in carolina street race all the time, so, i pretty much race every day,week. iam just always floor my gas pedal. So even 5mpg is possible. And yes, i do know there are a lot of people run e85, u are one of them.
You can try floor it all the time on your car, and u will know what iam talking about brother. Peace

 

New high in miles for me on a tank...

Normally I'll go about 175, maybe 180 on the same amount of gas (a bit under 12 gallons).

 

Well just got tuned with HTA Green and E85 awesome accel!

However I did just get 14.7 mpg . I still had about .5 gal of 93 octane when I converted this tank to E85 and I also had a lot of pulls for the road tuning. In case your wondering I drove 60.4 miles / 4.1 gal = 14.7 MPG.

I'm going to drive around some more and check for mpg's with little to no WOT pulls. Also at end of the week double check the injectors for gunk and clean them if needed.

However MPG and tuning got me thinking a little... One way I can look at it is, increasing timing theoretically results to more power and less throttle needed to keep speed or accelerate. This in turn should increase MPG's. But how much timing in low loads or before boost operation is beneficial for fuel economy?

Well anyways, what are you guys doing to your tune that helps your MPG's ? Any one mess around with timing to see any difference in fuel economy? Also do you still have your EGR active with the E85 tune?

 

With my current mods I average 13.5 Mpg. Roughly 170-180 Miles per tank

 

Just filled up. 54.4 miles 3.0X gallons = 18.13 MPG All city driving, but not much bumper to bumper traffic. Most of the speed cruising speed was around 35-40 mph. Maybe it's one of those one time thing? I'll continue to drive with the same style to see if I can duplicate it.

Also I'm not sure if too frequent of a fill up would affect the accuracy of the mpg calculation . But those were the results. Here is how I drove:

For the most part, I am giving light smooth accelerations to speed. I would accelerate to about 2,000 - 2,250 rpms before shifting. Depend on gear and scenario. Cruise RPMs at or below 2k rpms. I like cruising in 5th at 40 mph.

My Shep trans gear setup is:
1st gear = Evo 9
2nd gear = Evo 9
3rd gear = Evo 8
4th gear = Evo 8
5th gear = Evo 8

I have done some short WOT pulls, couldn't resist. I believe a total of 5-6 two gear pulls. At first I thought it was in my head, but two of my friends told me that my front end lifts during the pull.

Nothing was changed from my tune. But when my tuner was doing his magic, I did ask him to bump my timing for low loads (normal driving out of boost).

This weekend I'll probably pull the injectors and check for any gunk build up. (knock on wood)

 

Pretty tough to get accurate mpg data on small tank top-offs due to airspace in the tank and auto nozzle variations. Also short trips are going to penalize E85 due to warm-up being longer on E85. Example- on FFV's (which have quite a rich cold start enrichment) I will lose 2-3 mpg/tankfull if I start it cold, drive 2 miles to first stop vs driving 10 miles to first stop. This is true in both our Taurus and Impala fleet cars. If this would also hold true for your tune- it would effect your mpg 1-2. I cannot check this on my 2L turbo Saab however because I have yet to do the mods for E85.

On the gunk- it will be interesting to see if you find any. My fleet FFV's (4 of them) have 160,000, 186,000, 196,000, and 231,500 miles on them and have never had an injector out yet even though they have run almost exclusively on E85. The mpg and operability of these 4 cars is still equal to what they were when they were broken in. The E85 i use has only the fuel grade ethanol corrosion inhibitor in it for additive (required for all ethanol in the USA) and the gasoline portion of the E85 is unadditized ultra low sulfur natural gasoline (mostly C5 pentane as denaturant). Most E85 on the market however is made with fuel grade ethanol and normal pump gas with whatever additive is already in the gas.

I look forward to when the 2L tubo Buick Regal FFV hits the market late this year so we can see if the gunk seen once in a while with EVO's will show up in the Regal's boosted engine. If not- it could point to old gas deposits in the EVO tanks, fuel pressure vs cylinder pressure, parts used in the system, or injector style. If it does get deposits it would then perhaps point to problems with the standard gasoline addtives. With the NA FFV engines on the street today I have yet to have a warranty claim or even hear about a deposit issue from E85 sold thru the stations I operate- and this has been over nearly 10 million gallons of E85 sales. Nor have I heard this issue coming up from the guys that are drag or circle track racing on my E85 though I stay in contact with some of them.

 

^^ Interesting..

I'll put more driving mileage before filling on this gas tank.

Hopefully I dont have any of the gunk build up that the few reported cases out there. I did change the injectors same day as the conversion (FIC 1250 bluemax) and ran the gas tank real low that full tank was 13.6 gallons of our 14 gallon tank.

 

Just want to add my "2 cars" (acctualy turbo car died before I got the NT)

1G Eclipse GS (150hp) on E85 (850ccm inj. 255walbro, lambda 1.15 crusing, lambda 0.9WOT, 10.4:1 compression, Evo8 Ecu with custom rom) = 21.5mpg
It did 19-20mpg with stock Evo8 rom, so I guess tweaking it worked out the good way

1G Eclipse GST (~350hp) on E85 (850ccm inj. 255walbro, lambda 1.15 crusing, lambda 0.8WOT, 8.5:1 compression, stock Ecu with custom eprom) = 19mpg

But like I wrote its a Eclipse so less weight and 2WD only.
Both cars were driven in germany, 40% country, 30% city, 30% Autobahn and it was with very short gearing (3000rpm@60mph in 5th gear)

My goal is to get the GS turboed soon and fit a GST transmission with evo1-2-3 5th gear to it.
than fuel consumtion should be even better hoping for 23mpg

 

Not really. Mostly 14-15 mpg range. One time only 18 mpg.