Gas Saving

clean the inyectors and change the spark plugs

the best ways are still the old ways,
keep it tuned up,new wires,air filter,fuel filter,keep throttle body cleaned out,keep tire pressure at 35psi,
and you can see if your mileage increases by burning one tank of the middle gas instead of the lowest octane.

Just a silly question...how much driving do you do that is at 10mph? Most times this is less than 5%...so if everything else is fine why be concerned? As far as the why of it, you could have a slight vacuum leak or any number of sensors that are very slightly out of range, not enough to cause a problem, but enough to change mileage expectations. The addition of ethanol to our fuel has also impacted fuel mileage...The dirty little secret about any alcohol fuel is that nearly twice the amount of alcohol is necessary in order to produce the same energy output of gasoline...which will definitely lower mileage. Some power can be "recovered" by increasing compression ratios and changing engine timing (advance)...However today's vehicles are calibrated and built to burn gasoline and cannot without, major mods, be made to use anything but. Alternative fueled vehicles make a compromise in these areas but a compromise is just that.

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 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

Hope this helps Good Luck Loringh