9 MPG??? HELP!!! 911!!! - Ford Powerstroke Diesel Forum
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Old 02-05-2012, 06:25 PM
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9 MPG??? HELP!!! 911!!!

i know its had this stupid low speed shutter for a little while ive been unplugging icp sensors and swapping greyhead cps with other greyhead cps and blackhead cps....but 9mpg? thats a damn cry for help...i did an intake on it and yes it has the factory exhaust with the kitty and a muffler but no one in my town will let a couple feet of 3.5 piping go without charging for the whole stick. (after being on an exhaust rack for years that really pisses me off).. i see a fuel line under the hood by the filter thats wet but just barley moist and no buildup of fuel anywhere no puddles in the valley...last time i had codes read before switching the cps(es) was a failure of #8 under a contribution test...going back into the dealership to have codes read again....wtf could possibly be wrong?????????
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Old 02-05-2012, 06:26 PM
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btw 35 inch tires STOCK height F250 ex cab long box
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Old 02-06-2012, 10:55 AM
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OMG! 911!!! EMERGENCY!!! Nodd has crappy gas mileage.

35" tires are throwing your odometer off. You are actually traveling further than 1 mile for each mile shown. This also means your speed is off and so is your mpg. Need to do your MPGs by hand

Also keep in mind that you will still have an adverse effect from larger tires even after compensating for the extra diameter. I lost 2-3 mpg from bumping up to 33" on 10.5" rims after adjusting the speedo.

Figure out your true MPGs and then hit the search button. There are loads of threads on the various causes of low MPGs. Read up on them and create a check list. tackle each the best you can
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