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gas hog 1990 corvette

by jimmy jones
(covington ky,kenton co)

I only get between 13 and 14 miles to a gallom. Any ideas ? is this norm or is something wrong? its a 5.7

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Aug 16, 2011
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starstarstarstarstar 		Tune up or heavy foot
by: Anonymous

My 89 TPI gets a solid 25 mpg on the highway in 6th gear with a light foot.If you arent wearing your lead shoes then you need to consider a complete tune up.A check of the fuel pressure,fuel regulator and injecters is something Id consider as well.A bad oxygen sensor can cause the computer to beleive that the engine needs more fuel to equal with the air mixture.(drivers side Y-pipe with 1 wire connected to it;dont forget to use anti-seize on the threads).Thats where Id start if you havent ever replaced it.I think they are like $25.00 or so.I hope this helps you some and good luck.
Jul 28, 2011
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starstarstarstarstar 		My gas guzzler
by: jimmy

Thanks for the advise on what might be causing my gas mileage problems. But as far as the city I get 12 to 13. Highway goes anywhere from 17-21,and it is a six speed.I was wondering about the tires. I can't think of the sizes right now, but the rear are larger than the front. And for driving style,I do like hearing the roar in lower gears but I am staying away from so much low gear driving unless its called for. But I am going to see if they use eythenol in the gas in KY. You said it chandes yours it could change mine also. Lastly I guess I need to get the sencor replaced I guess. Thanks a million, been waiting for a answer from someone.
Jun 20, 2011
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starstarstarstarstar 		Gas Hog 1990 Corvette
by: Anonymous

Is this composit MPG or highway only, city, cold weather, auto or stick, what part of the country do they put ethanol in the gas as that hurts MPG. I just came to Mich. from the Carolinas and my MPG has suffered cause they put ethanol in the gas here, my composit has been as low as 19 down from the usual 23-24 on the highway it get's 28, mine is a auto. Driving habits play a large part also. I would hook up a scanner and see just what the stoichiometric is, if memory serves me correctly it should be 14.7 thats 14.7 parts air to one part fuel. O2 sensors could be the culprit. Good luck

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