A different gas mileage question

[91K5]

I've always paid attention to all posts about gas mileage, but was kind of wondering what kind of gas mileage drop one could expect with say a 6" lift and 35" tires? Since different year trucks will natrually start out with different mileage I thought this type of question might be more realistic. I'm getting a pretty good 15-16mpg on average in stock form, so I was just wondering if anyone knows a before and after gas mileage for their truck. My K5's a daily driver so it's somewhat important

 

[TorkDSR]

i got a lifted 79 k165 with a sbc400 and 307s and a 700 and sometimes i run 35s and get 8-11 with the 38.5 hawgs i get 7-10, but i gotta get some rears

beligerence doesn't justify intelligence.
<font color=blue>wheelers hate posers.</font color=blue>
<font color=red>79k15/400/700r4/205/38.5</font color=red>

 

[Headbanger]

I've got an '89 Blazer with 6" lift and 35" Super Swamper SSR's with a 4:56 gear change and usually get 10 to 11 mpg in town and 15 to 17 mpg highway with the 700R4 overdrive trans.

 

[90K5]

It is realloy hard to calculate this, because the new tires will cause the odometer to be off by about 12%, and when you change gears, they are never really that close to bringing it back to stock. It depends on what kind of driving you do. If you drive o nthe freeway a lot, it should be pretty good, but around town it will get worse because its harder to get those bigger tires moving. If I had to guess, you'll get somehwere around 12 mpg...the odometer will probably continue telling you that you get around 14-15 though...

90K5

 

[90K5]

Actually I messed up. You will get better thatnwhat the odometer says if you stick with stock gears, becuase you are going more miles than it thinks.

90K5

 

[k20]

shoot how y'all get it sooooo good? my truck gets about 6-8 everywhere . 33's, 4.10's, TH400, and 350TBI. wish i had a overdrive but my tranny will do. (till gas prices go back up
)

 

[K5Buckeye]

Just did a cross country roadtrip:
Originally my truck had 3.73's, 32 (actual measurement, 30.5), th-350, 350, carbed, headers, dual exhaust, no lift. I got 13-15 mpg on the freeway running 2500 rpms.
Currently, everything is the same except a 4 inch lift and 35 (actually just shy of 34). Just drove to WA from OH. Now, I get 11-12 at 2500 rpms. Hope that helps a bit.

1972 K5

 

[90K5]

I used to get 14 on the highway, 12 in the city with 33's, 3.42s' a 350TBI and 700R4. Now I have 4.11's and get about 13 in the city. These are corrected figures.

90K5