This may come off as a stupid question but I'm not an expert on cars so here goes. I have a TL 2008 which I absolutely love, I bought a K&N performance air filter for $54. Anyway yes acceleration is better but however I noticed it waste more gas? I put synthetic mobil 1 5w-20 every 3 k miles, I also change my oil filter to mobil one , so maintenance can't have anything to do with it.
If the engine is breathing better doesn't it work smoother and therefore waste less gas?
If the engine is breathing better doesn't it work smoother and therefore waste less gas?