10 miles to the gallon, 800 miles ad a quart (synthetic) check eng. light comes on from time to time. last code read was lean cond. both sides. new stock fuel pump and fuel regulator. eng. is stock 95 with 70,000 miles. recent tune up. any thoughts?
and what do you mean by tune up? some people think that changing the oil. oil filter and air filter is a tune up. every body has a different opinion on that. so you might want to specify what was done in that "tune up",