Quote Originally Posted by Unidentifiable
Can you show me any resource that says 10,000 miles is a valid break in point for a motor vehicle engine?

I don't believe in all the time I've been working on cars, I've ever heard that number. I've heard closer to 5,000 and I think that's about as high as I'd really be willing to believe.
I use 10,000 as a nice round number to make sure it is completely broken in. Different people have different driving styles and thus, break in will be different. I have tested many engine and compression is never complete at 5000-6000miles. At 10,000, everythign is usually broken in.

This engine is not dyno broken in at all. Any stating that thinks their mass produced 4 banger engine in korea is given the same treatment as a viper engine needs to get their info straight? They go on the dyno for one pass on the assembly line as they leave jsut as a quick check.

Even at 5000miles you stated, you are calculating the economy at 2000miles which means, the engine is not broken in yet and anyone stating that an engine doesn't need to be broken today needs to learn a lot more about engines.

People need to relax and stop getting all worried that their car isn't getting the exact fuel economy off of the dealer lot. Let the engine break in and the compression build and you will see it will climb over the next months.