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Originally Posted by Duke2.6
As a general rule, lower octane fuels have one to three percent more energy than premium grades, so if anything, fuel economy should be better, but tough to measure since the difference is so small.
Duke
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Duke,
Funny you should say that.
A friend of mine ( who is an absolute stickler on details, to the point of being anal at times ), tracked this very scenario for a long time.
Results,........lower octane fuel ( at least in his trial vehicle ), consistantly produced better mpg ( 1 - 3 % ), than premium fuel.
His test lasted about 12 months, and every detail was entered into his computer to the 100 th.
