Quote:
Originally Posted by Fatty
In some engines, namely high compression, high performance types, running higher octane fuel actually yields more power because the engine runs smoother. (with no change to the tune).
But for the most part, running higher octane fuel is nothing more than added insurance against engine knock...especially in hot Summer months where towing uphill in 100*F heat would DEFINITELY benefit from running 93+ octane.
I can tell you that the amount of any increase in fuel mileage you experience will NOT be equal to the cost increase of the premium fuel.
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No clue about the ECU but my truck runs better and gets better gas mileage on premium. It only costs me about $4 more a tank to fill with premium. Even if I get 1 mpg better mileage it works out to about the same price for gas. This is a very simple way to figure it out but we'll see.
87 octane- $3.00 93 octane- $3.20 to $3.30 (comes out to $4 more a tank (20 gallons) at $3.20 a gallon)
If I use 20 gallons and I get 300 miles out of those 20 gallons, with 87 octane it costs me $0.20 a gallon. Now if I get 1 mpg better with premium (which I get 1-2 better) that would mean I would get 20 more miles out of 20 gallons of gas or 320 miles. So it would cost me $0.20 a gallon or the same as using 87 octane. So it costs roughly the same as using the cheap gas and the truck runs better so use what you want, I use premium.
I know that is not real world but it was the simplest way to explain it. Oh and I hope my math is right, it's late.
