Miles per Gallon
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Senior User
Joined: Aug 2002
Posts: 327
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From: Saskatchewan
Miles per Gallon
I bout a 2wd because I thought that I would save a lot on gas, because 4wd gets worse gas milage.
My question is if the 4wd is not engaged what would be the difference in mpg (all else being equal) keep in mind I am talking about older vehicles
My question is if the 4wd is not engaged what would be the difference in mpg (all else being equal) keep in mind I am talking about older vehicles
Posting Guru
Joined: Dec 2002
Posts: 1,297
Likes: 3
From: Billings MT
Miles per Gallon
I think that the difference just stems from extra weight. You've got a t-case, a heavier front end, different front end components, another drive shaft....
I'm not sure, but that is what I think.
I bet somebody out here can give specific weight differences and a maybe a better idea.
I'm not sure, but that is what I think.
I bet somebody out here can give specific weight differences and a maybe a better idea.
Senior User
Joined: Jan 2003
Posts: 333
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From: Safford, Arizona
Miles per Gallon
A 2wd truck with the same gears, tranny, and tire size will not use a noticeable more amount of gas. The only difference will be from the weight. The reason 4wd trucks usually use more gas is because they generally have larger tires, lower gears, and then the added weight. If you are that worried about mpg, why drive a '70's truck?
Just my 2 cents.
Just my 2 cents.
Senior User
Joined: Oct 2002
Posts: 293
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From: Trempealeau Wisconsin
Miles per Gallon
Thats right, since you are pushing what is basically a nother rear end, that means about 400 lbs more a 2wd, plus the T-case thats another 100 lbs or 175 if its a NP 205, plus the drive shaft another 45-50 lbs. So a grand total of 600 lbs or more. But the real killer in mileage it the fact that you have more turn mass, the T-case. Is the same principal as if you put bigger tires on your truck, the mileage will go down because it takes more power to turn them. Then once you lock in the hubs, even if you don't pull the T-case into 4wd you are tried to turn all kind of weight, so kiss your mileage good bye. Like with my truck I get usually 13 mpg in 2wd, with just the hubs locked in it goes down to 10-10.5 mpg, and in 4wd I am lucky to get 10mpg.
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Senior User
Joined: Aug 2002
Posts: 327
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From: Saskatchewan
Miles per Gallon
That is actually alot less then I was thinking it would be, I aint worried about MPG, just curious as to the difference thats all, I know these trucks (well mine for sure) are pigs
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