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Awful fuel mileage after whipple install.

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Old 12-22-2017, 08:53 AM
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Too much acceleration
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Default Awful fuel mileage after whipple install.
I have a 2wd Lariat, I recently installed a whipple with the stock throttle body. I have driven about 15 miles so far and the fuel mileage is awful. My average WAS about 17.7. After the whipple install, the average is 12.1. A drop was expected but not this much. Should I be worried about this or will it get better? Could I have a fuel leak? If you have a whipple, please tell me your average. Did you see a big MPG drop after you installed the whipple?
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Old 12-22-2017, 10:02 AM
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Do you have a vacuum leak? running bad?

Good 93 octane?
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Old 12-22-2017, 02:03 PM
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you've driven 15 miles, and you're watching the electronic gauge. Bruh.

Perhaps run through a couple tanks and calculate it manually before calling it terrible?
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Old 12-22-2017, 02:14 PM
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How often has your foot been to the floor since the install?
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Old 12-22-2017, 02:23 PM
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Sounds like leadfootitus. I had that when I had my Procarged 01' Supercrew, it got 14 mpg average.
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Old 12-22-2017, 03:45 PM
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It shouldn't affect it very much. But 15 miles is hardly enough to tell if it really changed.
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Old 12-22-2017, 04:08 PM
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Originally Posted by turbobusa
I have a 2wd Lariat, I recently installed a whipple with the stock throttle body. I have driven about 15 miles so far and the fuel mileage is awful. My average WAS about 17.7. After the whipple install, the average is 12.1. A drop was expected but not this much. Should I be worried about this or will it get better? Could I have a fuel leak? If you have a whipple, please tell me your average. Did you see a big MPG drop after you installed the whipple?
I notice this after every modification that I add then after multiple tanks the true mileage will start to show.
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Old 12-22-2017, 07:03 PM
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Go take a drive and hold 45 mph, 55mph, and 65mph. Report back with findings.
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Old 12-22-2017, 08:04 PM
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Originally Posted by engineermike
It shouldn't affect it very much. But 15 miles is hardly enough to tell if it really changed.
Man, i hope you guys are right about this. Right now this bad fuel mileage would be the only spoiler. Are you running the 3.31 gears also?
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Old 12-22-2017, 08:06 PM
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I'm running 3.31's. I'm averaging 20.0 mpg since installing the Sc.
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