bpeight

i have an 08 civic with 41,000 miles. when i first got the car, new, i was getting anywhere from 36-42 mpg. all my driving in highway miles going about 70mph. ever since i got over about 30,000 miles i have been getting anywhere from 29-31 mpg. i am doing the same driving and do not floor it or don't go above 3000 rpm. I just got new tires and nothing shows up on the dash that there is something wrong. any help would be appreciated

ILUVMYCIVICGURL

Hey everyone i have a 2008 honda civic ex sedan is there any modifications i can do to my car to increase mpgs? like cold air intakes anything im willing to spend money thanks

gearbox

iTrader: (95)

short ram intake works better for mileage. it draws warmer air from the engine bay and this causes the computer to inject less fuel.

fdwlaw

A few things I can think of are:

1. Air filter
2. Changed type of fuel
3. Changed type of oil (or viscosity)
4. Changed driving habits (you said you didn't though)
5. O2 sensor/injectors/fuel pump/computer
6. Something causing drag (emergency brake, wheel bearings, alignment, engine wear.....).
7. Winter temperatures, some additives are added to fuels so they don't freeze (something I heard) causing lower mpg's.
8. Additional weight

Since your loosing 5 - 10 mpg's something has changed, but it would be hard to figure out unless you car throughs a code.

lazlong

#7 is probably the culprit. We're all getting crappy mileage due to winter blend.