Ever since I purchased the car in Dec. of 06 the dashboard display has been telling me that I am only getting 19 miles per gal. city and 20 highway. I have asked the service reps about this twice and have received some rather lame answers. I thought I was suppose to get 28.
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When you do a tune up you should replace the cap, rotor, plugs, wires,airfilter, and fuel filter, this will insure that you get the best mileage. Also have the coil checked, for proper resistance. If it starts to get weak it will throw a lower than normal voltage spark. You can not look at spark plug wires and tell if they are good, this can only be done with an ohm meter. The resistance should be 3000 to 6000 ohms per foot of wire. One other note is if your car feels sluggish or lacks power is to check the catalitic converter. These clog up and stop air flow thru the engine. There are many many things on cars that will result in poor gas mileage. A good mechanic doesn't go by just the codes a car spits out, they have to read the numbers and diagnose what is wrong.
yes it very possible because the catalytic converter is part of the emissions and you need to ask yourself when was the last time you had a good tuneup drive belt,sparks and wires if needed and a fuel filter and a pvc valve.
change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.
I don't know from where you bought the car but do you feel certain that typical causes such as fouled plugs or clogged air filters are not at fault?
Most dealers, even the shlocks don't normally skimp on the simple stuff but who knows about a private source?
That does seem low, especially the city numbers. I don't think Hyundai is any leader in gas mileage but they are better than what you are getting.
I was just listening to Car Talk on NPR (Click & Clack) talking about this exact thing in response to a callers complaint about poor mileage. Their advise was to: a. check the compression and b. check the thermostat. With your 2001 being 7 years old your mileage is probably under 100,000 so your compression is probably OK. If you do check it the good compression should be about 150 PSI; if it's down around 100 PSI that could account for the poor mileage. As for the thermostat if your engine temperature doesn't get un into the normal range fairly soon, the computer thinks the engine is cold and adjusts the choke accordingly which uses more gas