Gasoline Mileage improvement after break in.
This is the first vehicle that I have ever owned, and I have owned many, that actually improved its fuel mileage a lot after the first 5,000 miles. It is a Silverado 2500HD with the 6.0 gasoline engi...
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Higher mileage after break in is probably more of a myth carried over from the old days when we set up race engines on the loose side of tolerances to make them rev higher and easier. With modern manufacturing techniques, they probably get it pretty close to right before it leaves the factory. Like others have often mentioned, if we want mileage, get a Prius.
