My mpg's are way down I am only getting about 105 miles per full tank of gas. I put new spark plugs in and a new 02 and still mpg's are way down what do I do next?

The gas tank holds 18.5 gallons and the car gets 17 - 25 miles per gallon. On the freeway you can expect around 24 mpg.
So for your trip you could go 330 miles on a tank of gas.
14 gallons x 24 mpg

the fuel pressure regulator will not do it. you need to look at spark plugs ,wires ,air filter, fuel filter. tires pressure if tires are under pressure can cause bad gas mpg

Lead foot, tire pressures, stop /go driving. AC/poor compression, Trunk full of sandbags, transmission slipping, Wheel bearing friction, Brake shoe always on, etc.

I have a 4cyl 97 jeep wrangler. My fuel economy went from 75-80 miles per 1/4 tank to 55-60 miles per 1/4 tank of gas. I traced this to a bad coolant temp sensor (replace twice), and fouled O2 sensors believed caused by my self by placing too much oil on spector air filter (now wipe off excess and let dry in sun), and using carb cleaner and or gas treatment (stopped using). fuel economy went back up to 75-85 miles per 1/4 tank. (also disruption of sensor input/output signals didn't help from battery sliding into computer wiring harness, which I cured by placing a 1" spacer on rear clamp to keep battery away from computer.)

One tank of gas is not enough to compare mileage. Or are you saying the computer's readout of mpg estimate is showing less? Try a tank or two of premium and see if that helps. Keep track of gas mileage. Driving techniques have a lot to do with gas mileage, as does long trips vs. short trips, highway cruising vs. city driving. For best mileage, do regular maintenance and keep the car in top running condition-good spark plugs and clean filters and clean oil ! Attend to minor problems before they escalate.
If you want to check actual miles per gallon, start with a full tank. Write the odometer reading down, and go. Everytime you put gas in, write down the amount. When you are close to 1,000 miles from the time you started, go fill the tank and include that amount of gas to your previous list. Now add up all the gas used and divide it into the miles to get miles per gallon. (976 miles/31.8 gallons = 30.69 mpg ) . Only one tank will skew your numbers, might be off cause the tank was filled more to the top than the previous fill-up. About a thousand miles of driving will give you a very accurate figure of miles per gallon for your car.

I'm not sure of the mileage on your truck, but there are a number of things that you can do to improve your gas mileage. If the truck has over 100,000 miles, the next time you change your oil you can choose engine oil that is specifically designed for high mileage vehicles (make sure that it is the correct weight for your vehicle) Change your air filter, this has alot to do with fuel efficiency. Make sure that you get your tires rotated and balanced every 5,000 miles. Also check your tread wear on all 4 tires. If you have significantly uneven tread on your tires this can have a drastic effect on mpg. Check your plug wires: if they look worn and old replace them. If they appear to be in good shape then you can get away with only getting new spark plugs. If you are really dedicated to the truck you can always opt for a fuel system flush at your local service station, I know they offer this service at Midas in my area for $99. Lastly I used to have 98 Stratus that got poor gas mileage. I started putting a bottle of the STP treatment (in the black bottle not red) during every fill up and it averaged an extra 40 miles per tank. Hope this helps.

It just depends on your tank size. You probably get about 15 -18 miles per gallon. 13 gallon tank would be around 200 miles. 15 gallon tank around 232 miles.

estimate towards capacity versus miles,for example if you get 300 miles on a ten gallon tank then your getting 30mpg.you should on a 02 checy v6 probably around 24-26 hwy mpg,check odometer at next fill up.











TIM............

new plugs,plug wires,air filter,keep air in tires at 35psi,

Your car should average roughly 32.5 mpg-US (7.24 L/100 km; 39.0 mpg-imp)