Marky Dissod
Full Access Member
Note: this thread is NOT about whether or not you/anyone should buy E85 based on price vs range.
Short answer to that question is: if ethanol price is 74% of gasoline price or less,
DEFINITELY buy E85, because ethanol's drop in range is about 25%.
No one has yet quantified how much cleaner ethanol burns vs petrol (less carbon buildup),
and only you can quantify things like smiles per gallon for yourself.
However, what CAN be quantified, is the minimum amount of ethanol needed to raise 87 octane petrol to 91 octane ...
Assuming MINIMUMS of 50% ethanol E85 in winter @ 99 octane
Tahoes with 26 gallon tanks need to add 8.56 gallons of 'E85' to 17.44 gallons of 87 octane gasoline, for a 91.0 octane tank.
Suburbans w/ 31 gal tanks need to add 10.21 gallons of 'E85' to 20.79 gallons of 87 octane gasoline, for a 91.0 octane tank.
then scroll down to the advanced calculator.
Short answer to that question is: if ethanol price is 74% of gasoline price or less,
DEFINITELY buy E85, because ethanol's drop in range is about 25%.
No one has yet quantified how much cleaner ethanol burns vs petrol (less carbon buildup),
and only you can quantify things like smiles per gallon for yourself.
However, what CAN be quantified, is the minimum amount of ethanol needed to raise 87 octane petrol to 91 octane ...
Assuming MINIMUMS of 50% ethanol E85 in winter @ 99 octane
Tahoes with 26 gallon tanks need to add 8.56 gallons of 'E85' to 17.44 gallons of 87 octane gasoline, for a 91.0 octane tank.
Suburbans w/ 31 gal tanks need to add 10.21 gallons of 'E85' to 20.79 gallons of 87 octane gasoline, for a 91.0 octane tank.
then scroll down to the advanced calculator.
Last edited:
