2004 Honda Civic Hybrid. I drive the same route of 300 miles on the interstate 2 or more times a month. I drive the same speed each time at the posted speed limit which varies from 65- 70 miles/hour. I have consistantly gotten 45 miles per gallon. After an oil change and tune up by the dealer servoce center in the fall 2008 the mileage immediately dropped to 38 miles per gallon. I checked my tire pressure and it improved to 39 miles per gallon. Any other suggestions?

SOURCE: 2003 Honda Civic -LX Timing belt

90000 Miles on the Timing Belt. Do not let this go! A timing belt failure can cause internal engine problems.

Should cost around 200 or so, depending upon your local labor rates.

Good Luck!

Brian

SOURCE: High fuel consumption

Check the following things: air filter, wheel alignment, and timing belt, all of them if not serviced on time can affect your fuel consumption. I do not think its the heat because I drive my car in Phoenix AZ with temperatures comparable to Dubai and I still get 500+ km/tank.

Good Luck,

Alex (Civic 2003 1.7 manual)

SOURCE: Honda-crv 2008, When to change the oil.

Honda say thats not true and to wait until the car tells you when to change it. I have a 2008 CRV and you should and can wait till the oil say 15%! We took ours in after a long road trip for our first oil change. We had over 5K and the oil said 65%. The guy said that we did not need to bring it in. We still had change it while it was their but the car goes around 8-9 K on a oil change. A little wrench will come on and the oil life % will come on when it reach15% and will come on every time you start the car till you get it changed.

SOURCE: the tire pressure light won't go off....

You could have a defective pressure sensor causing this.
One more thing, some have a sensor in the spare tire.
Did you check that?

SOURCE: I have 2009 Honda Civic Hybrid,light for IMA is on

yes,