First things I would look at is,did they put 10w30 oil in and not 5w20 or 0w20,it makes a difference in mileage (if they run out of the correct viscosity oil they WILL put in what they have).
Did the service include a spark plug change?Is the spark plug gap correct?
Did they do a brake service?Is a brake dragging,a little to tight?Did they clean the throttle body?Maybe the engine was running a little lean before and now is at the proper fuel mixture,with less MPGs but running clean at the exhaust.
Weather conditions?Head winds and colder temps reduce MPG.
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?
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