I am getting 15-17mpg with most of it being highway. My a/f is 15.7:1 at cruise.

 

I went from around 20mpg overall w/ 93 to about 15 w/ E85 that is beating the H**L out of the car everytime I have it out

 

Copy and paste from a previous post of mine:
I was really bored and had a full tank of E85 in my car. So, i decided to see how many miles i can go if i baby the car. I drove from West LA to Willow Springs and drove back home and then some trying to maintain 70MPH and staying off boost (my gps says i did 67MPH avg) . The drive to Willow Springs, once you get on the 14N, is a LOT of long uphill highways. So, i was probably boosting anywhere fromn 0-5psi on the long uphill stretches. However, on the way home it was a lot of downhill driving.

I drove until my fuel light came on and drove for 10 about more minutes (245 miles on trip) and i filled up my tank with gas again (12.1 gallons).

According to my fuzzy math
245 miles / 12.1 gallons gas added to tank = 20.24MPG

I probably could've squeezed more MPG if i picked some flatter roads to drive on...and yes i really do need a life


On "normal" driving with occasional blasts down the highway, 15MPG...

 

I sent you a PM

 

When I first converted to E85 (22,000 miles ago) I averaged almost 20mpg 325hp/335tq DynoDynamics.

After installing FP4r cams and some more boost I average abot 17.5mpg or 12 gallons to 210miles. On a recent road trip to the cabin I averaged 19.8mpg at 70mph.

1000cc PTE injectors, single walbro, DBPerformance tune by Shane Zeigler.

 

On a 180 mile road trip, I got about 18 mpg with mostly steady cruising at 60-65 mph and some easy city driving. Now working to improve that with timing and AFR changes. Would be much better if I were getting 18 mpg for daily driving. :-)

 

I got 17mpg on my last tank with a good chunk of freeway driving mixed in with a fair bit of WOT I'm using twin Walbros, 1000cc PTE injectors, AEM EMS and an English Racing tune!

Tom

 

I'm just curious..... aside from the cold start issue (below 40*) have you fellas encountered anything else that isn't quite right?

 

My wife doesn't like the smell of E85, but I think that makes her not quite right. I like the smell. :-)

So far, all good for me. No different than driving with gasoline. I really like the idea of E85 because it should keep the cylinder temperatures lower, and its so much more stable against serious detonation. The only issue that concerns me is possible accelerated engine wear due to cold start corrosion or perhaps cylinder washdown. Might not be apparent until 30,000+ miles from now.

 

Not everybody has cold start issues under 40F. It really depends on where you live and what blend E85 is being used i think. My car starts on half crank well below freezing temps.

 

^ Interesting.

 

What mspilot said.

My car gave me a couple difficult starts in the winter (car would sit for four days in sub zero without ever being started) but it would start. Most mornings it started with an extra crank or two but then it would start right up.

I don't even change my tune on the winter fuels, I just don't get into the throttle as much.

 

Someone please correct me if I'm wrong here...

It is my understanding that when running gasoline and you live in an area that adds Ethanol in the winter (i.e. E10), the best thing is to get your car tuned in the winter that way the tune is always safe in the summer.

Conversely, when running E85 and you live in an area that adds gasoline in the winter (i.e. E70), the best thing is to get your car tuned in the summer that way the tune is always safe in the winter.

Obviously getting tuned monthly would also work, but cost a lot more.

 

Its the exact opposite. Tune for the fuel with the least amount of ethanol. The eventual better option will be map interpolation with a flex fuel sensor. That's still a few months down the road though.

 

Looking forward to that when that happens. Love our ECU!