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Old 02-15-2012, 12:23 PM   #1
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Default Gas mileage

Have a 98 f150 with a 4.2L v6 n I can't understand why I have really bad gas mileage!! I do have 30 inch tires in it but I didn't think it would hurt it that bad!! I can't go 8 miles down the road without using almost a quarter tank of gas! Any suggestions? Could really use some help.
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Old 02-15-2012, 10:15 PM   #2
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I also have a 98 f150 with a 4.2 V6. I'm getting about 14-16 mpg average. I have only had this truck for about a month and I haven't gone through the ignition and fuel system etc. yet but I plan to change the plugs, wires, coils, clean MAP sensor and possibly punch out the catalytic converter. All that should help. If you are not exaggerating about 8 miles per 1/4 tank you have a pretty serious issue I think.
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Old 02-20-2012, 10:25 AM   #3
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Check for codes, even if the CEL is not on. Does the engine get up to normal operating temperature? When it is cold the computer allows for a rich condition just as if the choke was not fully open.
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Old 02-21-2012, 03:17 PM   #4
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Quote:
Originally Posted by Kaleb View Post
Have a 98 f150 with a 4.2L v6 n I can't understand why I have really bad gas mileage!! I do have 30 inch tires in it but I didn't think it would hurt it that bad!! I can't go 8 miles down the road without using almost a quarter tank of gas! Any suggestions? Could really use some help.
Thanks
Check for a fuel leak. Whens the last time you gave it a tune up?
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Old 02-22-2012, 10:02 AM   #5
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The check engine light is on but it was reading an oxygen sensor and I have changed that since and the light still came back on after I reset the computer. The last time it had a tune up was probly about a year ago
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