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The best way to improve gas mileage is to change your driving habits. K&N filters claim they can increase mileage, but there really is not 'miracle device' that can do so. Make sure the vehicle is running well, plugs and wires are all in good shape, air and fuel filters are clean.
Stay on highways as much as possible, and drive around with a glass of water that has no lid and is filled pretty high. Attempt to drive without spilling the water. This will drastically improve economy.
A few things that can be done is to do a full tune up: Plugs, wires cap, rotor, air filter and oil change. That will help. Also replacing or cleaning sensors like the Throttle position valve, Air intake valve, Air Temperature sensor and O2 sensors will greatly improve economy. Those sensors help to determine the proper air/ fuel ratio. if the mix is too lean or rich you will burn through gas. These relatively cheap repairs will definately help. i did all this to my 99' ram 4x4 last week and increased MPG from 9.8 to 13.4 mpg.
You did not say which engine you have. If it is the 5.7L V8, your only going to get12 or 13 mpg. You might try a new set of spark plugs and a new air filter. I put the E3 plugs in my 4.3 GMC and the mileage jumped dramatically. They are a little pricey, but what isn't these days?
Okay... K&N drop-in filter, NGK V-Power plugs (and NGK wires), run tires 2-4psi over manufacturer's recommendation, replace fuel filter anually, use a good fuel system cleaner every oil change, use synthetic oil in the crankcase, transmission AND differentials, drive with windows up and A/C off (just vents), drive 55mph on freeway (this one is HUGE), slow acceleration and try not to drive short distances. These are all "hyper-mileage" techniques that garner better fuel economy. If there is a mechanical problem causing the fuel economy to be bad, the spark plugs, wires and filters ought to be a help.
here are a couple of different problems that will cause bad fuel mileage. first is air filter, still getting low mpg. then the pcv valve. clean fuel system.the cost of filter about $20 pcv was $12 and the fuel system cleaning and pcv is easy to do. when cleaning the fuel system,clean the injectors the fuel rail and the throttle body be sure that you have them change the oil or that you do it after they work on it. Notice whether the oil smelled like fuel then your engine needs platinum plugs for best spark they can run as much as $8 each.
A really dirty air filter will knock down your gas mileage greatly....yes. Also keep in mind that you don't get as good of mileage around town, as you do on the freeway.....35 mpg isn't too shabby....oh and please give me a rating....thank you