Fuel Mileage questions I know I know!!

[zilla68]

ok, then I'll tear into them on saturday afternoon and see what we find!!

thanks alot, I love the truck, just can't afford to drive it, lol. Very far at least

 

[cowboy_dan]

Here is some info I found:

how does that affect mileage?

Did you recalibrate the speedometer when you put the bigger tires on? If not, then your speedometer and odometer (and trip odometer) are off. In this case about 3.5% (divide one circumference by the other). Since miles on the odometer is less than the actual miles traveled, that makes the mileage (MPG) read about 3.5% low.

 

[zilla68]

good question, truck came with those on it, but I doubt it was ever recalibrated.
good info though,

thanks

 

[1996 Scorpion]

Re-calibrate your speedo, mine was still set on stock settings with my 40x15.5R17's and I was showing about 13 mpg's now that I recalibrated it I'm at 15 MPG's city.

 

[zilla68]

hmmmmmmmmm, can it be done with a mt2500 scanner, or what do I need to do it with.

 

[StrokerTurbo7.3]

Re-calibrate your speedo, mine was still set on stock settings with my 40x15.5R17's and I was showing about 13 mpg's now that I recalibrated it I'm at 15 MPG's city.

It had to of been off atleast 15mph on the highway.LOL Mine is about 8-10 off on the highway with 36's.

I forgot to mention the mpg i threw out was not with the speedo calibrated. I would do it but i run 285's in the winter so it would just be off again. Lol

 

[black974door]

i put woodduck97's boost fooler on my truck and that damn thing woke my truck up. now i dont hit over boost! but one thing i did notice, with cruise on and on flat ground i would push 2lbs of boost. now same spot and even slight inclines i see only 1 or 1 1/2 lbs of boost. i can get anywhere between 230 and 320 outta each 3/4 tank. and thats filling it to the brim. 320 only happens on highway and i have to much of a heavy foot to get constint numbers

 

[woodduck97]

You guys and the tire sizeing are crazy. Take a GPS and ride down the road and how much do you want to bet it is correct or one MPH off. I could see if he had 54 inch bogger tires seeing 10MPG but he is not. He is running 285/75 tire. It is not that much of a difference over a stock size tire.

 

[zilla68]

I get about 175-90 miles on my back tank

 

[Yodersstrokin96]

i put woodduck97's boost fooler on my truck and that damn thing woke my truck up. now i dont hit over boost! but one thing i did notice, with cruise on and on flat ground i would push 2lbs of boost. now same spot and even slight inclines i see only 1 or 1 1/2 lbs of boost. i can get anywhere between 230 and 320 outta each 3/4 tank. and thats filling it to the brim. 320 only happens on highway and i have to much of a heavy foot to get constint numbers

320. . . . holy **** balls lol my trucks gets like 11 MPG

 

[woodduck97]

320. . . . holy **** balls lol my trucks gets like 11 MPG

Damn man I had everything u have in your sig and I still got better MPG.

 

[Yodersstrokin96]

i mean its usually on a trailer, but still feel like its sucking it down

 

[mattymx]

Most of the time I hear of an issue of low mpg's, it usually ends up being a boost or exhaust leak. Those can really kill mpg's. Check your up pipes for any soot at the connections.

 

[zilla68]

I did have one leak on the passenger side, back over a year ago, but I fixed that already. I need to dig into the boost or exhaust leak though, but no soot anywhere under the hood area.

 

[black974door]

I get about 175-90 miles on my back tank

i useally get anywhere between 90-150 befor my needle hits the F. and when i did the gps calculations im actually going faster then what the speedo gauge says so really im getting more miles then that

 

[StrokerTurbo7.3]

i useally get anywhere between 90-150 befor my needle hits the F. and when i did the gps calculations im actually going faster then what the speedo gauge says so really im getting more miles then that

Correct me if i'm here fellas but if you are going faster than what the speedo says then whatever number you are getting is false and in reality it should be less than that.

 

[1996 Scorpion]

It had to of been off atleast 15mph on the highway.LOL Mine is about 8-10 off on the highway with 36's.

I forgot to mention the mpg i threw out was not with the speedo calibrated. I would do it but i run 285's in the winter so it would just be off again. Lol

Yes sir when I was going 75 my speedo showed like 56.

 

[zilla68]

well last time around I got 200 to the rear tank.

Now I'm wondering if my chip settings are correct, cause this time I ran about equal in stock tune, and economy daily driver

 

[StrokerTurbo7.3]

well last time around I got 200 to the rear tank.

Now I'm wondering if my chip settings are correct, cause this time I ran about equal in stock tune, and economy daily driver

I'd say thats pretty good. You use your stock setting?oke:

 

[zilla68]

I'd say thats pretty good. You use your stock setting?oke:

I'm using what I think is stock, lol. that 200 was as of last saturday. I'm now wondering if my econo tune is in the right position, because it seems like I get worse mileage in that tune than any.