What's your mpg...

[RedBurb]

@HotWheelsBurban --Read your cool footnote ---I owned a '70 GMC Burb with a stroked 500 Cadillac + 4L80E! (549 cu). Sold it a few years ago because it was mostly just sitting ---sure wish I hadn't.

 

[RichLo]

How in the world are you getting 13mpg? That would be nice

The truck only has 130k on the clock and a PO did a lot of stuff to the engine and trans, I'm unsure exactly what he did as it was 3 or 4 PO's ago. But it has mandrel bent exhaust, a 'tune' apparently, K&N intake. I have not opened up the valve covers to inspect but I think it has roller rockers also.

On top of that, I usually try to set the cruise control and follow semi trailers as much as possible in that truck.

 

[Spareparts]

Good timing.
For the first time yesterday i went for a drive just to check my mileage.
Small hills between 60 and 70mph. Filled up before i left and when i got back. drove 63 miles and took 5gal even gas so 12.6mpg
1998 suburban K2500, 454, 4l80e, 4:10 gears. Tires are 245/65x16 very close to the ware indicators and speedo is almost right on according to gps.
Today she is getting new wheels and tires and it's about time too! LT265/75x16AT. The plan is to drive the same route/speed and check mileage and gps speed against speedo in the next few days.

 

[Gmc3500HD]

97 2500 4x4 5.7 285 tires 4.56 gears 12 to 13mpg city/15mpg on hwy @65mph. 10mpg towing 6k Gotta 99 3500HD 2wd 454 has the stock 19.5 tires 4.63 gears weighs 8520lbs 10mpg and gets 7 to 8 towing 6k

 

[YankeePaul]

99 K2500 Suburban 7.4, 4l80, 4:10 285/75r-16
14.5mpg hand calculated.

 

[LVJJJ]

'94 k1500 Suburban, 383 replacement ingine, dual exhaust, headers, 4L60E, stock wheels tires, 3.73 gears.

12-13 mph solo, 9 towing, some times 9.6. As RV'ing is our only source of entertainment, don't worry about gas mileage, ruins the fun.

 

[tksoldierx]

1995 K1500 ECSB, with a 1994 350ci gasser bored out to a 383 stroker, 3.73 ratio, on 16’s, with 4L60E and OD.

14mpg usually, I’ve had it drop down to about 9mpg towing a 24ft damn near fully loaded enclosed tool trailer

 

[HeavyAsAChevy]

1995 K1500 ECST, with a 1994 350ci gasser bored out to a 383 stroker, 3.73 ratio, on 16’s, with 4L60E and OD.

14mpg usually, I’ve had it drop down to about 9mpg towing a 24ft damn near fully loaded tool trailer

Sorry, but I sometimes don’t understand some abbreviations. What does ST stand for?

 

[tksoldierx]

Sorry, but I sometimes don’t understand some abbreviations. What does ST stand for?

Ah that was autocorrect on my phone. Meant to type ECSB! Fixed now

 

[scottydl]

My old GMT400 was a 1995 Suburban C2500 -- 454 non-vortec -- 4L80 -- 4.10 -- stock 245/75R16 tires. Empty commuting I averaged around 10 to 10.5mpg.

Towing my 9500# travel trailer was usually a stellar 6.5 to 7mpg.