fuel milage

[99'Subourbon]

14 mpg combined, K1500 Suburban, 285/75R16s, 3.73s, Vortec 350 - just for comparison.

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[oohunter04oo]

Well my truck is getting 14 it's a 97 305 4.11's and 285/70r17's. It has a slight misfire and leaking injectors. But also the speedo is 2mph fast.

I'm wondering if everyone's good or bad fuel mileage has something to do with the speedometer being off.

 

[99'Subourbon]

It may have been that my step in size was minimal, but my Speedo is maybe 1~ mph off. GPS and Speedo match each other, so I assume my self-calc mpg is accurate.

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[great white]

comparing mileage figures between vehicles is nearly pointless. Everything from vehicle configuration, to driver habits, to usage, to maintenance and condition, to geography changes it. PLus a couple dozen other factors I haven't mentioned.

A "range" is the best you can hope for.

10-15 is a reasonable expectation for the OP. 15 being a high side number when everything is just right on the highway...

 

[Hunttman01]

I average 10.5-11 in my 98 K2500 with 4.10 gears, 4l80e, and 235/85r16...

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[95z71performer]

I've been pulling 14 all winter with a tbs headers and no o2 sensor and I can't forget the half ass exhaust

 

[birchhatchery]

my truck still has the factory exhaust on it with 224 thousand miles on it cant belive it but it will probly fall off soon as water this winter is takin its toll on it

 

[95z71performer]

my truck still has the factory exhaust on it with 224 thousand miles on it cant belive it but it will probly fall off soon as water this winter is takin its toll on it

Water?????? you're lucky I'm hoping mine can hold up to the slush that keeps building up in places and the clamps that aren't tight enough I blame myself for that

 

[K15 Blazer]

the best ive ever gotten is 22MPG hwy... I average 14/15/16 with mild manners... I get 12 with a heavy foot hot-rodding around town

 

[Vortec Lover]

there is already a thread for this guys

http://www.gmt400.com/forum/showthread.php?13836-What-kind-of-mileage-do-you-get