Embarrassing question: What Gas? (87/e85)?
Tuned
Joined: Oct 2006
Posts: 449
Likes: 40
You can run either. E85 will drop the mpg 10%-15%. E85 is not always the same, the amount of ethanol in it varies with time of year. In the summer, hotter month is likely to closer to limit of 85% ethanol, in the winter (colder months) I have seen it down the 35% - 40% ethanol. The manual states to run at least one tank of regular per oil change interval. I would stick with regular if the truck is not regularly used and getting fresh fuel weekly, ethanol likes to absorb moisture more than regular. I can't say that I feel any difference in power running either. I would guess it's less likely to ping on ethanol and maybe run a but cooler too, but probably negligible in a truck.
Lead Driver
Joined: Jan 2006
Posts: 7,308
Likes: 250
From: Hartford, WI
The manual used to say that if E85 was used most of the time that you needed to run a tank or two of regular gas through every few thousand miles. I know with an old F150 we had E85 needed to be at least $.50/gallon cheaper just to break even because of the mileage loss. that was in 2007 though so maybe the trucks are more efficient with E85 now.
I tried E85 before on a GM. Towing SUCKED. Mileage went into the toilet. What I saved, I spent more time at the gas station filling up and mileage lost. Pass. Tried it on the Ford thanking that 15 years later, it might be better. Nope. Still SUCKS. Around here, it is hard to find E85 also.
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