Originally Posted by Aviator23
Wow, 15,000 miles! That's a long break-in! I even went as far al looking for non-etanol gas stations. I tanked it up a few days ago but so far, it hasn't seemed to make a difference.
These vehicles today are designed around the E10 & E15 ethanol blended gasoline,
so straight gasoline isnt gonna make much difference unless you add ignition timing.
Also, after a few oil changes, (and using a GOOD grade of synthetic oils) you`ll notice a slight MPG increase.
At 5,000 miles, its pretty much done all the major break-in you`ll ever see. Check your tire pressure too,
tire pressure makes a huge difference, type of tire will make a big difference too.
Check the air filter often too, critters like to make nice homes in there.