Quote:
Originally Posted by synolimit
Yeah shouldn't be an issue. 93 here has 10% E anyways so my tunes probably fine to run it almost dry and switch the map and fuel. Come winter the E drops to E70 so you're even closer.
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Exactly, its not that sensitive. Just for the sake of seeing the actual difference, lets look at some math:
Say you make the switch with 3/4 a gallon of E10 gasoline left in the tank...
In the tank you have:
0.075 gallon ethanol
0.675 gallon gas
You add 18 gallons (it should take more like 18.5) of E78 (just a random typical "e85" pump content):
You just added:
14.04 gallons ethanol
3.96 gallons gas
You now have in the tank:
14.115 gallons ethanol
4.635 gallons gas
With a total 18.75 gallons in the tank:
14.115 Ethanol / 18.75 total = .7528%
You have E75 in the car. This will not be a critical difference from E78.