Does exhaust lower gas mileage?
Bottom Line: Adding an after-market performance muffler or exhaust system will improve engine efficiency from 2-10%. Improvements in efficiency can be used to either increase horsepower or improve fuel economy. Whether this efficiency is used to go faster or to get better fuel economy is up to you and your foot!
What does it mean when Your MPG drops 20%?
BTW, there is a code if the ECT (engine coolant temp) does not come up withing a certain time frame. You could also have a fuel leak. My 2010 FIT dropped 20% immediately upon moving to a much colder climate. I checked tire pressure and changed air filter, changed gas stations. Still off by 20% ( 10 miles per gallon).
What causes a sudden drop in gas mileage?
Such a drastic drop in mileage is often associated with a bad 02 sensor. I’ve had them go bad and cause a 25-35% drop in fuel efficiency. Did you have anything done to the car just before the mileage dropped? A drop like this has to have an assignable cause, and it often traces back to a maintenance that was just performed.
How can I determine my gas mileage accurately?
Reset the trip odometer to zero and record the mileage when you fill up next. Using that and the gas volume on your receipt, you can determine the gas mileage accurately. I don’t know how you determined gas mileage and thought I’d mention this if you do it the other way. ok4450 July 6, 2016, 2:38am #9
BTW, there is a code if the ECT (engine coolant temp) does not come up withing a certain time frame. You could also have a fuel leak. My 2010 FIT dropped 20% immediately upon moving to a much colder climate. I checked tire pressure and changed air filter, changed gas stations. Still off by 20% ( 10 miles per gallon).
Such a drastic drop in mileage is often associated with a bad 02 sensor. I’ve had them go bad and cause a 25-35% drop in fuel efficiency. Did you have anything done to the car just before the mileage dropped? A drop like this has to have an assignable cause, and it often traces back to a maintenance that was just performed.
Reset the trip odometer to zero and record the mileage when you fill up next. Using that and the gas volume on your receipt, you can determine the gas mileage accurately. I don’t know how you determined gas mileage and thought I’d mention this if you do it the other way. ok4450 July 6, 2016, 2:38am #9