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Greetings everyone!
I have a 1990 740GL (auto) with 143,800+ miles at the clock. Had a complete tune-up 2000 miles ago; change oil and filter every 6 months or 3000 miles, last change was one month ago (about 400 miles). Using a Purolator oil filter and Chevron 20W-50 (regular) oil.
I am averaging 14MPG, this is regardless of how lightly I am on the gas or how heavy my foot gets.
At this point I am stuck on what could possibly be causing such poor mileage, and seek your help.
Anything you guys can offer would be greatly appreciated!
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