What are ya'll getting for mpg?

[chasinbass]

96 w/ 305 @ 240k and get 16 mpg


Sent from my iPhone using Tapatalk

 

[magimerlin]

Not enough..... but we drive trucks with the aerodynamics of a brick....lol....

sent from what use to be a great country...

 

[skylark]

My tbi 350, 4500, and 3:73 open with 33s gets about 20 all around, but I'm really light on throttle

Your drive a unicorn powered by leprechaun farts.

 

[df2x4]

My last tank in the red truck was about 25MPG. I'm not easy on the pedal, either.

RCLB C1500, 4.3L V6. 3.42s, factory tire size, factory height.

The Suburban isn't quite as forgiving, it usually gets around 18MPG.

Suburban K1500, 5.7L. 3.73s, factory height, factory tire size.

 

[DaltonB98]

My last tank in the red truck was about 25MPG. I'm not easy on the pedal, either.

RCLB C1500, 4.3L V6. 3.42s, factory tire size, factory height.

The Suburban isn't quite as forgiving, it usually gets around 18MPG.

Suburban K1500, 5.7L. 3.73s, factory height, factory tire size.

Damn your old dinosaurs got the same/better MPG then my 07 Mazda 6 lol.

On topic though my 5.7L K1500 gets around 14mpg mostly highway driven. Not sure of the tire size or gears.

 

[Curt]

On topic though my 5.7L K1500 gets around 14mpg mostly highway driven. Not sure of the tire size or gears.

Got a picture of the RPO codes in the glovebox? Also here's a couple good article describing how to read your tire's sidewall: http://www.caranddriver.com/reviews/how-to-read-a-tire-sidewall-feature

https://m.pepboys.com/tires/treadsmart/understanding_tire_markings



Sent from my iPhone using Tapatalk

 

[DaltonB98]

I always mean to but whenever I think about it i'm always at work or in my other car lol. But I know how to read the tire size, I just bought it a year ago and hate the tires/rims so was never interested in knowing the size or anything, but he just put the tires on so i'm going to wear them out before I buy something else.

 

[90halfton]

Maybe because yours is a burban but my truck with 3.42 and 285's (32.5") got 16 on a normal week and 18 highway.



The gear ratios that are slightly higher than recommended provide better fuel economy not worse. You're issue is it's a TBI 1st of all, your tires are also smaller than they should be


Sent from my iPhone using Tapatalk

Maybe because yours is a burban but my truck with 3.42 and 285's (32.5") got 16 on a normal week and 18 highway.



The gear ratios that are slightly higher than recommended provide better fuel economy not worse. You're issue is it's a TBI 1st of all, your tires are also smaller than they should be


Sent from my iPhone using Tapatalk

Lower numerical gear with large tires does not equal better mpg in a heavy ish 4wd suburban. 28" tires are factory size for a c1500. Had 3.08 gears but swapped em out while rebuilding rear end due to the gutlessness of hwy gears. Wasn't a huge change but definitely noticeable, slightly better mpg as well

 

[aaronb]

my giant brick gets 11-12mpg with a 350 vortec, 4l60e, 5.13s with 40's.

 

[shovelbill]

how is everyone with "non" stock tires figuring their mileage? are you factoring in the % change in the speedo from stock?

my '98 rcsb, 5.7 w/170K, 4L60, 3.42'sand stock 265/75-16 was getting 12.5-13 highway at 74 mph.....8-10 in the city proper. i pass everything i can at WOT.

after i blew all that up i now have the GM Performance HT383E(w/ Voltant AB, JBA shorties, Magflo non CA cats and JBA single cat back), 4L70, 3.42 and 265/70-17 Duratracs getting 12.5-13.5 highway at 74 mph.....city driving is around 10. i should try it @ 65, but i'm impatient.

when i tune it i'm sure the fuel economy will go up.......as will the power.

i have a tonneau cover too.