Real world pickup fuel mileage?

[Lawnman23]

My 98 K1500 with the same drivetrain and rear gears as yours but with stock 265/75/16 tires get 14-15 mpg on average with 17 being the best it ever got on a long trip over 20 years ago.

I also have a 98 K3500 with the 7.4L/ 4L80E/4.10 gears/ 245/75/16 tires and it gets around 10-13 mpg unloaded and 8-9mpg hauling or towing.

Yep, with stock sized tires, 15 sounds right.

The 7.4 BBC is a drinker but the torque for its time was fantastic. I drove a K3500 CCLB 7.4 SRW a few times and although it was slow as a dog, it felt like you could pull a house off its foundation. Paled in comparison to the 6.5 TD of its time I'm sure but

 

[mr_boring]

~18 mpg and I consider that pretty good for the way I drive it.
2018 F150, Supercrew, 3.55 gears, 4X4, 36 gallon tank, 20" Terra Grapplers, and every other option that makes it heavy. Payload is only like 1240

 

[wtd]

Yep, with stock sized tires, 15 sounds right.

The 7.4 BBC is a drinker but the torque for its time was fantastic. I drove a K3500 CCLB 7.4 SRW a few times and although it was slow as a dog, it felt like you could pull a house off its foundation. Paled in comparison to the 6.5 TD of its time I'm sure but

Yes, the 7.4L only had 290 HP but had 410 ft lbs of torque for the vortec version.

 

[GMBoy]

My truck's avg as displayed on the clusters are:

2016 Ram Limited 4x4 Hemi - 18.8mpg
2020 Jeep Gladiator (gas hog with 35" tires) - 16.1mpg
2006 GMC Sierra Denali 6.0L AWD - 14.1 mpg

 

[Silverado12]

2000 Dakota extended cab with the 3.9L/auto.. As I say I might as well punch a hole in the tank. In the lower teens regardless of highway or city. The trans really kills it. The RV gets 4 or 5 less mpg and it's way bigger with the 6.0L. I've thought about swapping a 4.8 or 5.3 in it.

Those 3.9 Dakotas seem to last longer than any other truck I know of, though. I've seen two with over 400K miles and one was on the original transmission. Both never had the motor opened up for anything.

 

[DGXR]

Fuelly says my average is 23.6 MPG over 139,081 miles tracked, pretty good overall. But who wants to drive a stock 4-cylinder automatic pickup truck? Most people are too interested in looking cool and buy giant noisy 4wd beasts for their stressful mall crawling LOL

 

[wander2039]

Those 3.9 Dakotas seem to last longer than any other truck I know of, though. I've seen two with over 400K miles and one was on the original transmission. Both never had the motor opened up for anything.

The Dodge cast iron 6’s do seem to live a long life. The transmissions on the other hand.

 

[cptbarkey]

OP, if you mean a 5.7 tundra, good luck. The 4.6 isnt much thriftier. I have the same engine in my SUV, I get 17 max, about 10-11 when towing. I dont care though, its smooth as silk.