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I have a 97 F-150 2wd 4.2L v6. I can only get 185-200 miles on a tank of gas. I don't understand why. There is no leaks. Changed the spark plugs, air filter and a few other little things and no change.
 

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It may be using more fuel because of the 6 cyl. It has to work harder to do the same job. I have the 4.6 v8 and it gets about 225 to 235 pulling the equip.
 

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The 4.2 is low on torque,any chance iis your driving habits?heavy foot,high speeds or long warm ups,and idling time kill mileage.
 

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Could be the computer is screwed up. Not adjusting the amount of fuel used. I've had the computer on mine reprogrammed by dealership.
 
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