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Old 23 Jan 2013, 12:48 am
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Default my 1991 honda civic use to get well over 40mpg 5 yrs ago, but now only around 32, what caused it?

have done a good tune up on it already, but not replace anything else yet.
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Old 23 Jan 2013, 01:01 am
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try changing your fuel filter and the oil also check valve seals and transmission filter as aa car ages it gets carbon build up this can cut down fuel mileage also try checking your air intake lack of air can also bring down fuel mileage
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Old 23 Jan 2013, 01:16 am
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Cound be your EGR valve.
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Old 23 Jan 2013, 01:32 am
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chances are your mistaken. that car only got mid 20s and 30 on highway. 40 mpg over 20 years ago is was unheard of
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Old 23 Jan 2013, 01:48 am
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agree can be carbon buildup on the egr & the pathways; people on honda tech, acura world are having similar issues & when they follow some member's DIYers & youtube vids on how to clean them out using seafoam or a physical remval-brushing out... their MPGs go back up

specs say MPG was 28/33 city/highway so getting close to 40 with mostly highway miles is possible

are you still doing the same amount of city/highway driving?

gas is being diluted with ethanol nowadays & it's in the middle of the winter season; everyone's mpg will suffer during this time of year unless you're in a southern state that has relatively warm temps all year around

don't forget about the timing belt for your maintenance; if it snaps, your engine is INTERFERENCE & will be damaged!
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Old 23 Jan 2013, 02:01 am
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you couldnt have got 40mpg back then. check your egr that might be the problem
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Old 23 Jan 2013, 02:18 am
Sky Sky is offline
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Certain models of the 1991 Civic do not have a EGR valve.... Why are people saying you can't get 40 MPGs back then. 1988-1991 Crx HF(high fuel) got 48-52 mpgs back then.... People, don't answer if you are going to give wrong answers. Now besides what has been said (carbon build up) do you smell a slight sulfur smell ever coming out of your exhaust? If you do, it is your catalytic converter that is causing it.
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Old 23 Jan 2013, 02:33 am
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Not like it has anything to do with lower overall compression numbers for all of the cylinders. Lower compression numbers = a lower compression ratio = less efficient motor = less MPGs. Nothing short of a rebuild will bring back those old mpg numbers.
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