TJKJ, do you know what the dealer does for their flush? I guess I am not positive mine was "reverse flushed", although I do know that is what Tuffy's does (almost went there to save $$). Since Tuffy's does this, I assume the dealer did.
I am questioning this now, because I am fairly positive my filter was NOT changed, but I can recall an explanation involving "chemicals".
If the reverse flush truly does hurt any-mileage ****** AND that IS what the dealer does, then I might have to make a stop there on the way home...