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Four tire alignment? This being off will eat up gas madly.
Do you advance the timing in small increments until you get optimum advance?
Tire pressure for sure. Keep it 8 - 10 lbs. above recommended.
What kind of unnecessary weight do you carry? Dump it.
Is your thermostat correct? This can easily fool you...a temp gauge slightly off can deceive you. Cheap and easy replacement.
What weight oil in the transmission? Thin it out with Marvel
What is on the inside of your exhaust pipe? Should be gray and dry.
A high flow air filter won't hurt.
Check the radiator for air flow and make sure no one has blocked areas behind the grill or underneath the car. Blocked flow in the engine compartment invites problems fuel wise.
Try 2500 rpm shifts...
I hope this helps
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