what will cause for my 1999 Honda civic lx to start using twice much gas

Asked by Sep 13, 2015 at 09:05 AM about the 1999 Honda Civic LX

Question type: Maintenance & Repair

2 Answers

1,375

air filter. maybe needs a tune up

67,325

Make sure that the transmission is shifting properly and it's going into overdrive with torque converter clutch lock up. If not, it'll kill your gas mileage. At expressway speeds (60 to 70 MPH) your engine should be running at around 1200 to 1500 RPMs. If not, it's a transmission, as described above, problem. HTH. -Jim

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