How do you increase your gas mileage? Spark plugs replaced @ 60,ooo miles on 1994 Saturn SL1

I have 82,000 miles now. I know tire pressure helps but what else can I do? Just put gas in @ 60 miles because gauge doesn't work. $3.98 per gal and 23.9 gallons put in. Your advise was to keep the tank full. Paid 10.42. How do you find out how many miles per gallon? divide 24 into 60 miles? No good mileage if I'm correct. Should I replace spark plugs? I saw the estimate you gave me. Fuel filter? Air filter? Thanks so much four your help. From a grandmother Kathy

by in Portland, OR on July 24, 2013
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2 answers
ANSWER by , July 24, 2013
You do not have to keep the tank full! Your tank holds 12.8 gal. The car should get at the very least 25mpg . That's 320.00 miles! So on a full tank you can SAFELY drive 250.00 miles before you need more fuel!! Unless it is leaking, or someone is stealing your gas. When the tank is full, reset the "trip odometer" by pushing the reset button and keep a check on the miles driven, you can drive the 250.00 miles before you need gas. Do this each time you fill the tank. Or have the gauge fixed!
ANSWER by , July 25, 2013
agree with pushrod