HIGH OCTANE FUELS

[andaconda]

Originally Posted by roxy1

buy higher octane, believing mileage will increase. trying to prove it now driving more conscientiously. mileage increases. kind of a self fulfilling prophecy. not due to higher octane. no scientific explanation will explain higher mpg's from higher octane.

now im going to go.....on myself......as punishment for getting sucked into this ludicrous discussion.

Well, I'll get sucked into this discussion:

At work I drive a 2005 Buick AWD van with a large v6 engine, and average between 5,000 and 6,000 miles a month. I have had time to 'experiment' with octane ratings. For two months I used premium grade gasoline and averaged 21.8 mpg. For two months I used the lowest grade and averaged 21.9 mpg. My trips are mostly highway miles with about 5% city driving. I cover the state from corner to corner so all my trips are about the same. I use mostly the same brand of fuel. The weather conditions were about the same when I 'experimented.' I drive fairly conservative with the work car just as I would with my own car.

I see no real difference between mileage and octane rating. The van must compensate for the octane and adjust accordingly. I notice no knock on any of the gasoline changes.

JUST my 2 cents worth.