Quote Originally Posted by randomhero View Post
Your software was most likely off which is normal when you start modding an engine.

The only way to measure fuel economy is manually log the mileage and amount of fuel consumed. Sorry, but you didn't get 27 mpg unless it was for only a couple miles downhill.
Correct. It's just hard to believe you're ACTUALLY getting 7-10 MPG better than everyone else with the same mods.