Fuel MPG?

[ADDICTED]

Question for all you Duramax Owners?
I have abrand new 05 HD on 37" toyo mud grapplers. Stock engine. I can bairly make it to Havasu with out running out of gas. This is roughly 250 miles from Corona. My dash says that I get 9.1MPG. What are some of you getting on your trucks?

[Party Cat]

Question for all you Duramax Owners?
I have abrand new 05 HD on 37" toyo mud grapplers. Stock engine. I can bairly make it to Havasu with out running out of gas. This is roughly 250 miles from Corona. My dash says that I get 9.1MPG. What are some of you getting on your trucks?
Shawn...
You must have a short bed...they have a smaller tank than the long beds...I can make it from OC to Havasu pulling a 7000+ boat on 1 tank....I usually average 11-12 mpg while towing...
Not pulling and keeping it under 80....I usually get 16-17 mpg....
04 Dually Crew Cab Long bed, 4x4 with 235's instead of the stock 215's...

[ADDICTED]

Yah its a shortbed. This is not towing either.

[Cole Trickle]

Sounds like our H2 with the 20's and 37" nitto terra graplers! :p
It takes us a full tank and a half to make it into Havasu pulling our boat.
How is Adam Diaz doing over there?;)
Brandin

[Magic34]

Yah its a shortbed. This is not towing either.
Not towing, I usually get around 15 on trips. I drove to Vegas (from Phoenix) about a month ago and got 15-16 and I don't drive her easy. I would drive between 75-95 the entire way.
Towing the boat or toy hauler, I have found that if I drive around 65 MPH, I can get 9.5 MPG or so. I like to get places faster, so at 75-80 MPH, it drops to the 7 MPG range or so.
I have 325/60R20 tires, about a 33" tire.
Someone makes a 40+ gallon fuel tank that replaces the stock one on our trucks. It is about $1000, but I think you know some people. :cool:

[ADDICTED]

Sounds like our H2 with the 20's and 37" nitto terra graplers! :p
It takes us a full tank and a half to make it into Havasu pulling our boat.
How is Adam Diaz doing over there?;)
Brandin
Good LOL! :D

[ADDICTED]

Not towing, I usually get around 15 on trips. I drove to Vegas (from Phoenix) about a month ago and got 15-16 and I don't drive her easy. I would drive between 75-95 the entire way.
Towing the boat or toy hauler, I have found that if I drive around 65 MPH, I can get 9.5 MPG or so. I like to get places faster, so at 75-80 MPH, it drops to the 7 MPG range or so.
I have 325/60R20 tires, about a 33" tire.
Someone makes a 40+ gallon fuel tank that replaces the stock one on our trucks. It is about $1000, but I think you know some people. :cool:
I drove home from Havasu 75-95 the entire way and at the most it said 9.1.
We will see if the exhaust will help with this?

[Magic34]

I drove home from Havasu 75-95 the entire way and at the most it said 9.1.
We will see if the exhaust will help with this?
I guess I forgot to say I have exhaust and the Edge Attitude, usually drive in mode #1.

[Magic34]

I drove home from Havasu 75-95 the entire way and at the most it said 9.1.
We will see if the exhaust will help with this?
Have you calculated it yourself (not using the computer). I have heard that they can be wrong fairly often.

[Cole Trickle]

Good LOL! :D
Nice!
Hopefully he didn't give away all of our secrets. :p :idea:

[ADDICTED]

Only the good ones :p :D

[djunkie]

If you have bigger than stock tires and have not reprogrammed your odometer than ignore what the dash says. Plus it seems that any tire change over stock will affect the mileage. My 05' has 3500 miles on it. 100% stock and the worst I've seen was 15.5mpg and that was on my way home with a head wind most of the way. Best so far was just under 18mpg.

[Cole Trickle]

Only the good ones :p :D
Dang....
There goes our top secret chamber technology with the custom whirlwind supercharged baffels!!!
We were about to start claiming 150hp gains like Aero Turbine :devil:
Brandin

[ADDICTED]

Well maybe then not all the good ones becuase we we only gained 132HP with that setup LOL!!

[Jordy]

We will see if the exhaust will help with this?
I can hook you up with a great exhaust guy. :D
I figured mine out after this last Havasu trip and I'm getting better than 16, with the odometer being off a little bit because of the 285's. I ran from my house to Havasu, around up there a bit, and then back home on less than 3/4 of a tank, granted it's also a longbed with a 34 gallon tank and I wasn't towing anything. I was running 80 or so pretty much the whole way.
I have this Gibson exhaust system on it ( :confused: :confused: :confused: ), a K&N FIPK kit and the Edge Juice/Attitude on it. Seems to get down the road pretty alright. ;)

[ChumpChange]

If you have bigger than stock tires and have not reprogrammed your odometer than ignore what the dash says.
Exactly. From door to door in my truck with larger than stock tires, my tripometer reads 250mi. In my stock car as well as Mapquest, it should be 272miles. If you account for how much your tripometer is off as then it should add a mpg to the overall mpg.

[Havasu Hangin']

Dare I say it...ChumpChange is right. My odometer shows 275 miles to Industrial in Havasu.
According to a tire calculator...your speedometer is about 21% off.

[slingingsmoke]

37" toyo mud grapplers.
...Heres your sign :messedup:
First off, NEVER trust the Over Head display. They are great liars!
Second, the mileage is lower because the overall diameter of your tire is soo large that the tripodometer is turning much slower. hence the very low numbers.
You also should have the gears replaced. It will get you up into your engine's powerband and not bog it down. You probably have 3:55 or a 3:73 stock rear end. You should have no less than a 4:10 gear ratio with tires that big (It'd be 4:56 if your truck was a gasser and not a D-Max)!
You will eventually ruin your Allison if you dont regear your truck! Also, I dont know if chevy does it, but at Ford, the dealer can reprogram your speedometer to correspond with larger tires. I think up to 35" tires right now. The 37" tire's overall diameter is just a tad bigger than 35"s.
Hope this helps. JON.

[Jordy]

You will eventually ruin your Allison if you dont regear your truck!
Really? I've heard that rumor for a while yet never seen it happen. ;)
Shawn, if anything happens to your tranny let me know as I have a great Allison hookup too. :D

[Kilrtoy]

Question for all you Duramax Owners?
I have abrand new 05 HD on 37" toyo mud grapplers. Stock engine. I can bairly make it to Havasu with out running out of gas. This is roughly 250 miles from Corona. My dash says that I get 9.1MPG. What are some of you getting on your trucks?
HEY FOCKER DID YOU STEAL MY TRUCK.......
You must have gotten one from the same batch I did, THE SHIT BATCH..............

[slingingsmoke]

OOOOOhhHHH...good point.....KT. If the real calculations still suck. Then check your injectors. Theyre probably leaking.
JON.

[Kilrtoy]

OOOOOhhHHH...good point.....KT. If the real calculations still suck. Then check your injectors. Theyre probably leaking.
JON.
and how do you do that.......

[slingingsmoke]

take it to the dealer. The diesel tech will pull each injector out and test fire each one. It could be one or more than one that is either not putting enough fuel in the mixture or too much!
JON.

[Three Days Only]

Addicted..............Call Me!!!

[Kilrtoy]

take it to the dealer. The diesel tech will pull each injector out and test fire each one. It could be one or more than one that is either not putting enough fuel in the mixture or too much!
JON.
I have asked them to do it twice.. THEY say all is fine...

[UnionJack]

11-12 mpg on 40' toyo's towing, so about 900 miles to a tank

[Just Tool'n]

I have a new 05 D/max CC long bed, only 3700 miles on it so far.
usally around town I get 15.5 to 16 MPG, On freeway driving to LA & back I get 17.5MPG.
We are talking bone stock here, I have not even pulled of the emblems or 4X4 stickers yet!