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Nah, I'm getting 47-52 mpg on the cheapest gas available for my vx. Gary |
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Gary |
I remember by old 240k miles VX motor hated to have 87 octane in it. To make it not ping I would always have to shift sooner when trying to keep the RPMs low, or I would just run mid-grade.
After I installed the 120k mile motor, it loves the cheap gas. It runs better on the cheap stuff than the old one ever did on the more expensive gas. (Both motors had a full tune-up done on them...I'm guessing the old one had a lot of carbon buildup?) |
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I should test it sometime with mine. Does yours get the same or better FE with high octane?
Wait, your Civic Si? I wonder if the sporty nature of your car has anything to do with it. Most sports cars can only use high octane gas. And the Si is a pretty sporty car. Well, that could be the reason, I dunno. My point is, your car prolly isn't going to be representative of non-sporty cars using high octane gas. |
Our cars weren't built for higher octane, stock combustion would be off...if anything I would say it would hurt mileage and possible emissions (slower burning fuel doesn't combust completely without timing changes and such).
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the si has a 10.2:1 compression ratio. its a tad higher than the 90s d series comrades. being sporty doesnt have much to do with it, unless a higher compression ratio is sporty :)
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