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Old February 1st, 2010, 09:40 PM   #41
Brods
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How are you figuring mpg? Was your speedo corrected for the tire diameter you are running? Larger diameter tires will make the uncorrected speedo/odometer think the truck is going slower/traveling less distance than it actually is and that will make the mpg seem lower than it really is.

Have you also checked the basic things like making sure your tire air pressure is right, your front alignment does not look like this /-----\ and you donít have a caliper or ebrake hanging up? What gears does your truck have?

In stock form the EPA numbers are 11 city 16 highway. As others have already mentioned, your lift and tires will definitely hurt mpg. If your trans is not going into OD or not locking the converter as often as it should that will hurt your mpg too.
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Old February 1st, 2010, 10:52 PM   #42
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figured millage from my GPS no calibration was done for tires..... alm sucks....tires are aired up....calp/ebrake is good and not hanging up
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Old February 2nd, 2010, 02:34 AM   #43
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with either my 265-75s or 255/85s in my 2000 k3500 SCLB, pulling the unimog, idling in the back yard and hauling firewood, rodding on it on back roads, babying it on the x-way, it gets between 12 and 13 every time. NEVER have gotten anything else. Stock 350. 14bff with 4.1x's, 4L80, front 9.25 ifs. 265s at 35 or 80 only make a difference on tread contact patch, not fuel economy. 255s always run at 60-65 lbs as they fit better on the stock GM rims.

I'm just starting to dig into how to bring it up. I screwed up the EGR hose on it so it no longer has it. Used to have dual cats, now no cats, no change. Just changed the coil. Full tune up recently ( 6 months) except injectors. Recent intake manifold gasket job, no change. 15w40 or 5w30, no change. Haven't run synthetics yet in the engine. Semi-synthetic in the diffs, no change.

I take that back, I did get 13.5 once coming out of the mountains in CO, where I was on a full coast for about 8 miles with no brake/throttle. Same trip with the cruise in the 87ish ground speed range i got 11.65mpg, corrected for tire size. She rolls like a turd! But it's a work truck, not a cadillac commuter!
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Old February 2nd, 2010, 09:34 PM   #44
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yeah idk how to bring up ima throw some plugs into it tom....ac prolly plats or rapid idk yet
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Old February 2nd, 2010, 10:05 PM   #45
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I've always stuck with Delco plugs... seem to work well and they're durable as snot.
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Old February 4th, 2010, 07:53 PM   #46
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autolite makes an incredible iridium plug that are 6.50 at autozone and if you haven't already change the primary o2 sensors(before the converter) i once gained over a 100 miles to a tank of gas on a car that i thought ran fine until i changed them..
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Old February 5th, 2010, 01:55 PM   #47
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coool but its stuck in my manifold cant get it out who would be able 2?
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Old February 5th, 2010, 01:57 PM   #48
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Quote:
Originally Posted by chevybtk View Post
coool but its stuck in my manifold cant get it out who would be able 2?
Mr. Oxygen and Mr. Acetyline, they're the best help money can buy
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Old February 5th, 2010, 11:55 PM   #49
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damn dont have any....sorry
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