87 perf tune ?
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Senior User
Joined: Nov 2007
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87 perf tune ?
Guys, been running some issues with my truck for a while, 2000 v-10 4x4 373 gears.... averaged 12-12.5 mpg up to last few months.... after y pipe and fm-70 muffler i have been getting 9.5 (+ -) did tune up last week , i think i had a boot split on one cop (#5), broke off on top of plug....with stock tune i got 12.5 that tank.... i had some issues loading new tunes on my x 3 tuner, got them straight so i loaded the 87 perf tune on my truck yesterday and today im down to a half a tank and only been 100 miles since fill up....true the truck seems to have a little more pep, but at a 30-40 percent drop in fuel mileage.....DAMN.... i also have the 87 economy and 87 tow haul. what are yall getting with your tunes? may have to dump the perf tune.....thanks guys
Hotshot
Joined: Mar 2007
Posts: 10,101
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From: Pa
If I do a bit of highway driving I can get over 150 miles out of half a tank pretty easy with the 87 Perf tune. Maybe you got a batch of fuel with extra ethanol in it or have a mechanical issue. I would run a few tanks through the truck with the 87 perf tune and allow the truck to learn the new tune and see what happens.
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true, i've got a bit of rough running at low rpms could be a cop dropping out...will give it a couple of tanks and see how it goes...at best i get 310 -315 out of a tankfull of chevron 87. keep away from ethanol if at all possible. thanks guys
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Joined: Dec 2009
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I average 12-14 with a mix of driving with the air conditioner on with the 87 performance tune and running 93.. I have seen as high as 18mpg with this setup on the Highway.. I installed the 93 performance tune earlier to see how it affects my truck and mileage..
My truck is a 99 v10 auto super cab f250 with 97,000 miles and a recent tune up..
My truck is a 99 v10 auto super cab f250 with 97,000 miles and a recent tune up..
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I changed the only 4 original cops i had with new ones...truck styill has a slight "chug" or miss at low rpm's. begining to think it may be crank sensor....any boby had issues with them, or what are the symptoms? thanks
