MAF cleaning.
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
Is 5mpg calculated with the tires factored in or not? Once you get the tank to a quarter put the seafoam in there then go fill up. I almost wonder if you have a sticking brake caliper or the hubs are locked in.
Freshman User
Joined: Nov 2014
Posts: 25
Likes: 0
Damn. The only time I got 4 mpg was when I was down 3 coil packs. I average 10.3 with 285s and 4.30s now after tune up. You don't have any misses do you? Any loss of power at all? Or a fuel smell after shut down? Leaking injectors and bad packs/boots/plugs will net you crap mileage like this. I get 10 no matter what I do. Even pulling 15k I still get 10 and I've got 278k on the ticker. Keep us posted.
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Freshman User
Joined: Mar 2015
Posts: 28
Likes: 0
From: Spokane, WA
Mileage is calculated to accomodate for a 7% increase in tire size. I am pretty sure i don't have any misses (not sure what I would be listening for), but the truck idles fine and doesn't have "holes" in the rythm of the idle, it seems pretty consistent. As far as the brakes go I don't have anywhere safe (all parking is on hills) to really get the truck up and check the brakes. I am not noticing any funny smells or anything like that. Again it's only the second tank and I haven't filled it back up to do a true calculation this has all be rough estimates.
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Freshman User
Joined: Mar 2015
Posts: 28
Likes: 0
From: Spokane, WA
I know, that's why I called them rough estimates. Filled the tank up today and those estimates weren't that far off. A little under 6 mpg is what my math produced. That's accounting for tire size.
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
Even though your tires are larger, you have the 4.30 gears which should still put you around the 3.73 range. And be better than 5-6 mpg.
Have you checked out the Washington chapter? there is a Spokane meet coming up, may be a time to tinker on the truck.
Have you checked out the Washington chapter? there is a Spokane meet coming up, may be a time to tinker on the truck.
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Freshman User
Joined: Mar 2015
Posts: 28
Likes: 0
From: Spokane, WA
update
So I went ahead and ran a bottle of injector cleaner through the last tank. Same driving, I averaged 7.9 mpg for 3/4 tank. Went to the junk yard and bought a new airbox with the snorkel/intake hose attached and will put that on to see if that helps with air flow.
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Cargo Master
Joined: Jun 2010
Posts: 2,113
Likes: 4
From: Iowa
What did use for injector cleaner? For that big a bump from 5mpg I want to run some of that stuff! Lol. Seriously after you confirm the intake replacement mpg dump a bunch of that injector cleaner in multiple times if it made that big a difference.
New User
Joined: Apr 2015
Posts: 15
Likes: 0
That is insane. With 2" lift, 315 tires, 250k miles, pulling a loaded trailer around town I get 10mpg all the time. And 11-12 with out it. You need to check your coil packs. I was getting 8mpg when I was down 2 packs. Also with doin your calculations for your MPG. Fill the truck up all the way and reset your milage. Drive it for awhile, Fill it up again then take the distance you drove and divide it by the gallons of gas. There is no way your truck should be getting that. These trucks whether lifted or under load stay roughly the same.
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Freshman User
Joined: Mar 2015
Posts: 28
Likes: 0
From: Spokane, WA
I don't want to sound rude, but did you just tell me how to calculate milage?