well i checked the air filter it looks pretty good. i put new plugs in a month or two ago. i dont mess with my mass airflow sensor just because i know that they can be real touchy to any sort of oil thats why when u put in a K&N filter sometimes the oil gets on the mass airflow sensor and messes with *****. Just changed the oil and new filter, hubs are not locked in. I try not to hoss it off the line and I never go above 3,000 rpm's. Im just thinking for a toyota 14.5 miles to the gallon is pretty *****. any one messed with there cpu with a programer to get better mileage?