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right on. my commentary was that, at least from what i saw, you ought to be a long way from enough miles and tanks especially when trying to be objective. To put it in perspective the difference between your initial 13.5gal avg and the 13.72 mpg improvement is a savings of 0.23Gal of gas in...

controlled MPG testing is actually *really* hard to duplicate. I had a 130 mile round trip commute ~3000 miles a month and it was hard to test for MPG changes. Same 4miles in town, 61miles interstate 5 days a week. With careful observation i could throw out outliers i.e. weather and...

Yeah i agree, its a industry thing.

I suspect its mostly thin ring packs more than anything.

We've had a bunch of high mile (200k+) 88-93 v8 trucks/vans the couple i had heads off of did not have a feel able ridge and had cross hatch in the cylinder despite feeling wore out. They all "ran OK" but wore out is more than just having cylinder ridge. I think with that many miles its a...

Interfooler.