Maybe a fuelish question?
Just wondering if you get better mileage towing with premium gas that does not have alcohol in it over regular gas with alcohol?
Forum Discussion
The 10% ethanol in regular fuel will not harm engines, large or small, when used before it has time to separate. It is the long term effect of stagnant alcohol in the fuel that causes damage to fuel lines, o-rings, seals, etc. Fuel stabilizers, such as Stabil, are generally not effective in stopping the danger of fuel-water-alcohol separation. Unless the formula has changed in the last year or so, Stabil (and most other common similar products) actually contain alcohol. There are a few which don't have alcohol and are actually useful. The reason why smaller engines, like lawnmowers, outboards, generators, etc. run better on non-ethanol is because typically the pure gas being sold is a higher octane.
Locally, there are multiple sources for 90 octane non-ethanol fuel. A couple of years ago, the price was much higher, but now it's leveled into being about 40 cents more than standard 87 octane. I choose to run it in all of my non-car engines. For about a one-year period, I ran nothing but non-ethanol 90 octane in my 2007 Silverdao with 5.3. My results were almost consistently 10-12% better fuel mileage. I felt that the truck did indeed run better when using it.
Locally, there are multiple sources for 90 octane non-ethanol fuel. A couple of years ago, the price was much higher, but now it's leveled into being about 40 cents more than standard 87 octane. I choose to run it in all of my non-car engines. For about a one-year period, I ran nothing but non-ethanol 90 octane in my 2007 Silverdao with 5.3. My results were almost consistently 10-12% better fuel mileage. I felt that the truck did indeed run better when using it.
