Posted by Jon Hagen on May 06, 2008 at 20:43:59 from (12.175.230.39):
In Reply to: Re: E85 posted by Bob on May 06, 2008 at 18:25:56:
I suspect the genuine FFV's have the fuel calibration set plenty rich on E85 to CTA on warrenty issues. It is pretty common to see a FFV use 20-30% more gallons of E85 VS gasoline, yet I have seen several non FFV's that show as little as a 10% drop when running E85. I don't know if the non FFV fuel system runs pretty lean on E85 or what might make the difference. My 2000 Dakota with non FFV 4.7 V8 has shown a pretty consistant 10% (2 mpg) drop in economy using E85 Vs 87 octane regular. I suspect the knock sensor retards the timing a bit on 87 octane stuff, because the rig does make better mileage on 91 octane premium.
I suspect that the 100 + octane of E85 allows full spark advance without detonation, which helps compensate for some of the lower BTU's of E85, plus I wonder if it runs a bit lean on E85
My mpg runs were from Goodrich to Fargo and back, about 400 miles per trip, with the only difference being the fuel. Far enough that I consider the results reasonably accurate.
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