Since then, I've been getting a solid 17.5... I've even seen 18.7

 

E85 is very sensitive to your driving style. If you just cruise (have no fun), you can get decent mileage. As soon as you start to have fun, even a little bit, your mileage will suffer.

 

What is the shortcoming with your OEM ECU? What do you hope to gain via the AEM? Just curious.

 

i have no complaints with the stock ECU, the tuner/shop im going thru (Emery @ Streettuned) spoke with me over my goals before i started ordering my parts and he has said for the route i am going the easiest way for him to get everything to run right and proper is for a AEM. I honestly dont care either way and can still get my car registered. I saw how easy his was to drive and start up and for what im doing i dont see a need to keep applying patches to fool the stock ECU into not checking for my evap, rear o2, blow thru maf set up. The only reason im going with E85 is i dont have 100 bucks per 5 gallons of C16

 

I am averaging 13 mpg back and forth to work each day. I think something is wrong with my right foot mod tho

 

ya same here, im gonna get in trouble with this new turbo i think..LOL!

 

After installing an aftermarket O2 housing and porting the exhaust manifold and hotside, I was able to get about 18.8 mpg on about 80% highway and 20% city.

 

avg 16.5 mpg. Not much freeway but allot of 55mph going to and from work. Half of the time its typically around the town driving.

 

I've been running straight E85 and no switching around for about 8 tanks now. I'm getting 21.5-22mpg 90% highway 10% city. On all city driving I am getting 18-20mpg. I get on it plenty, probably run it 0-100mph pulls every 40 miles on the highway and twice that in the "city". Car weighs 3420 with me in it and goes 115mph in the quarter.

A key to good mileage on E85 is good fueling. Run some gasolene in the car and let it idle for 5 minutes. Pull the plugs. They should all be the same exact hue at the tips on a new set of plugs. I've noticed may cars that are very choppy at idle with larger injectors. Some styles of injectors can't open correctly at idle due to the fact that the mitsubishi ecu does not have true low impedance drivers. The opening time is lethargic and changes drastically across the cylinders. E85 "cures" the problem on most cars because it requires more fuel and is less sensitive to poor fueling. However the problem still exists and causes a waste of fuel when idling and driving around with the injector operating at low pulsewidths.

 

That's pretty impressive mileage for E85. 18-20 around town is not too bad for gasoline. Have you checked the ethanol content of the E85 that you use? What injectors are you using? Any other mods that you think are helping with the mileage?

 

Have not checked ethanol percentage but it is summer blend as it indeed runs leaner than the winter stuff. Travis gets the similar city mpg I believe. I only have air filter, cataback, and GM BCS. Nothing that I can think of to drastically improve MPG other than I now have 54K miles on the car so it is well worn in.

 

Yea my best city driving was 18.8 and I was around 21mpg on the highway w/ a car load of stuff for a trip and traveling up and down hills/mtns to my destination.

i have tbe, gm bcs, amsoil cone filter, O2 housing, and ID1000's....also running stock O2 and no lean burn setup of any kind.

On gasoline I would get 22-23 city and 26/27 mostly highway.....my trip to obx this summer I had 3 people in my car + loaded to the point nothing more went into the trunk or beside the rear passenger on the seat and still avg. about 25 mpg on that trip.

 

I've got a similar setup except I've got a stock airbox, so I'm thinking maybe the cone filter is helping you guys. I've also got a cat.

 

I haven't even checked my mileage yet in a year of running E85. I'll have to do that when I fill up again.

 

I run the amsoil filter with 2g maf adapter from verocious motorsports (great company to deal with for fab parts btw). I do believe this may have netted 1mpg but it might have also been a placebo effect so I didn't want to mention it. I will tell you that I ran a filter sold by a certain company and I was less than pleased with the amount of dirt I found in my intake. Maybe it works for race cars but it has no business going on a real street car that is driven in all weather conditions. I am happy to report that the amsoil filter leaves the intake nice and clean and seems to also provide a nice low pressure drop. MAP performance sells the filters or just contact the one amsoil dealer on this board from flordia, he is a real good honest guy.