Quote:
Originally Posted by rmay635703
I started testing a mix of 87 e10 e85 and 91 ethanol free
Thus far my lie o-meter reads 60mpg on flat ground when before it topped at about 53mpg on the same stretch but only if my motor is warm, my startup/warmup FE is MUCH lower.
Very odd effect.
My test mix is
50% e10
30% e85
20% 91 e0
The car hops less accelerating during warmup.
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That's a lot of E85! Just for kicks I decided to add 1.3 gallons of E85 to the 9.2 gallons of 87 (we only have E10 in California) and maybe 1 gallon left in the tank, for a 20% ethanol blend. The E85 was rather expensive at 3.89/gallon, but this was just to see what would happen. I had a tiny bit of knocking at low speed even after "steam cleaning" my engine, so I was thinking maybe running some more alcohol would help wash it out a bit more. I figured just 1 tank of E20 can't be any worse than pouring some fuel injector cleaner stuff in, and though I lost about 1 dollar because of the E85's price, my octane rating is probably bumped up a little so it's just like buying 89 instead of 87 or something I figure.
Observations so far: engine seems a little smoother, but I did switch from Chevron to NTG so maybe there is a gas blend difference. Cold idle seems to be a little rougher, but not sure. MPGs don't appear to be affected, but it's obviously going to be hard to tell. Engine doesn't idle consistently and seems to have slightly out of calibration O2 sensors as the exhaust always smells a little like unburned HC, so that's another unknown. I should log the timing sometime, I think it was a little lower than normal last time, hopefully the ethanol is allowing full advance.