matt.s

Hate to create another mpg thread...but this is starting to sicken me.

My dad and I have almost the same truck, down to the model year, trim, and rear end. Only difference besides paint color is mine is 4wd and his is 2wd. My lifetime avg is 15.6 and my dads is 20.3. Both trucks are stock except for bed covers and driven mostly highway.

We've done quite a bit of trials both in the city and on the highway and even driving each others trucks. Our driving style must very similar as I get fantastic mileage in his truck while he gets dismal mileage in mine...and rubs it in every chance he gets. Sigh.

In city only trials he gets about 17-18 while I get 11-12 and on the highway it's about 2-3 mpg difference. So I think most of the problem is taking off from a start but I dunno

So...what's the reason for this...that's what I'm trying to determine. Or is this normal? I don't think 200 lbs of weight and a little bit of resistance from the 4wd components would cause 5mpg diff lifetime. There's a slight difference in tire size too I guess

Makes me wanna trade in for something else.

Centexguy

It's called things aren't all built the same.

Bull_Duck

Is the rear end gearing the same on both ?

Shan

How hard are you leaving every stop? I would have to do some serious pedal mashing to get 11-12 mpg with a 4wd 3.73 running 295/70/18 nittos.

jtetterton

How helpful. Please enlighten us.

jtetterton

Yup

Centexguy

So many variables. Engine tolerances, bearing tolerances, cam tolerances, tuning variations, drivetrain tolerances, tire pressures, filters, the list goes on and on. Just accept the difference or get something different.

matt.s

Dude, very lightly, trust me. I dont let the tach get over 2k. But it is noticeable you have to push my pedal bit more to getting up to speed than my dads.

My lifetime avg is only .7 higher than the 5.7L Tundra I traded in for this one.

Understandable and if it was 1-2 difference I'd accept that...but this is a bit much. If there's that much variation between trucks to cause a 3+ mpg difference then maybe I should get something else. My question is: what can I do with these variances. What should I look for? Or tell the dealer to look into?

Adobe2X

You mentioned that tire size is different between the two trucks....how MUCH different?
If you've gone to bigger tires on your 4X4, then the mpg difference may be fully explained right there.

matt.s

Stock tires...however the 4wd comes with 275/65R18 and his is 265/60/R18. I would totally swap out tires if I thought it would prove something but I don't think it would.