What's your MPG?. . .

[Bigslug]

. . .and what did you do to get it?

Due to differences in gearing, tire size, etc. . ., and engine (F, 2F, Detroit V8, etc. . .) no manufacturers seem wiling to attach a number to what their overdrives, rings + pinions, fuel injection, etc. . .will actually do for you.

This makes it darned hard for the cash-strapped among us to decide if a specific modification is worth the effort.

So:

What's your motor?
What's your tires?
What's your MPG pre-mod?
What's your mods?
What's your MPG post-mod?

 

[D'Animal]

2F, H42, Rock Box, 3:1 Orion, 4:11's with Detroit in the rear and ARB up front rolling on 38's.

On the trail it is about, well it really depends on the trail.

On the highway doing the speed limit with the top on and the windsheild up I get about 9mpg.

 

[bustanutley]

when I was rolling on 37s I drove to moab and got 14mpg. This is with a HIGH milage F sm420 and 4.11s

edit: with a webber 38

 

[cpratt]

Motor: SBC 400
Tires: 33's
Stock 4 speed, transfer case, and 4:11's

Highway, about 10 mpg

 

[FF LC FREAK]

Stock 71 F motor
33x12.50 BFG Mud Terrains
4.11 gears
~15 MPG on the highway (55-60 mph)
Less around town
Way less on the trail

 

[aircrew]

How much would a 78 B diesel get? That is what I am rebuilding, and what about the 3b????

 

[Cruiser_GT]

What's your motor? 2f de-smog
What's your tires? 31x10.5
What's your MPG pre-mod? 9mpg
What's your mods? No mod... fixed vac leaks and advanced timing.
What's your MPG post-mod? 12+ mpg (city and per odometer)

 

[PhrogsPhorever]

What's your motor? 2F
What's your tires? 31/10.50R15
What's your MPG pre-mod? 13-14MPG (Weber DGAS38)
What's your mods? Putting the stock Aisin Carb on as we speak.
What's your MPG post-mod? Will let you know

S/F
Kush

 

[Joe Egolf]

1981 BJ42 - 3b - stock gears -4 spd - 28 mpg hwy

 

[Weedhopper]

You rat! 28??? I am jealous. Got your pm, lets get together some Sat AM.
78 2F Bone stock, 31" tires... 11.28 mpg last I checked, all around town driving.

 

[missipboy]

sbc with holley truck avenger carb (pricey, but not a bad carb)
nv4500 - overdrive is supposed to help, right?
4.11 gears
35" ssr's

last 200 mile trip i got 8.5, but i have since adjusted my timing a little bit. i can't wait to check again. i've got to be able to do better.

 

[steenh]

What's your motor? F
Tranny? SM420
What's your tires? 33/10.50R15
Gears? 3.73's
What's your MPG? 14-16 MPG Highway at 60 - 65 (Rochester 1 bbl)

I'm not changing a thing...

 

[Tigerstripe40]

What's your motor?
2F, rebuilt, desmogged, and warmed up several years ago.

What's your tires?
35" Goodyear Wrangler MT/R

What's your MPG pre-mod?
10-12

What's your mods?
REbuild motor, Jim C Carb, non-USA dizzy (with points!), Man-a-Fre header, SM420,
35" tires, locker, 4.11 gears

What's your MPG post-mod?
Average 14-16 mpg. With much variation. It's been as high as 19mpg and as low as 11 mpg

 

[mjrsfj40]

Motor: 1F (siamese port single barrel Carter carb, K&N Filter, Modified HEI distributor with HO coil, 8mm wires and "light" advance springs, autolite 87(?) plugs gapped at .065)

Trans: Stock 3-speed
Tires: 31/10.5-15" Firestone Wilderness MT
Axles: Stock w/4.11
Mileage: In town- 12.5, highway-14.5

I want more power, but not at the expense of fuel($). Based on the numbers I read here, V-8 conversion may wait!

 

[Trollhole]

What's your motor? 2f, run hard put up wet, Weber 38, stock gears

What's your tires? 35" Procomp TA

What's your MPG pre-mod? 10 if I was lucky

What's your mods? Went back to stock carb desmogged.

What's your MPG post-mod? 14-16 and I still give it hell

In the process mod? 87, 2f bored .040, balanced, RV cam, TBI, headers and very gay

MPG target? 14-18 Depending on how heavy my foot will be.

 

[Enigma]

[



What's your motor? '69 SBC 350, bored 30 over, 10.5:1 pistons ( I think-been awhile) "RV" cam, performer intake, Qjet carb, AA headers, etc etc


What's your tires? 35" BFG mud t/a's

What's your MPG pre-mod? no clue..its been like that forever

What's your mods? Spring over, SM465, stock 4:11 diffs (open)


What's your MPG post-mod? 15 mpg or so on the way into work (30 km drive) combined highway/city. No idea trailwise what it is.

 

[DiHrdBowTi]

78 FJ40
GM crate 350 w/ HEI
Holley Projection TBI (old analog)
Ranger 2 speed splitter
stock 4speed and gears rolling 35's
single 3 inch exhaust
15-18 depending on how my foot is feeling
Also haven't dialed in the TBI computer for best possible MPG..

 

[jhaha]

I thought it was measured in "fun per gallon"?

Just kidding

350 with an RV cam, Edelbrock carb
4 speed
4" lift with Q78 swampers

13-15 mpg

Can't wait to go TBI

 

[BAD BILLY]

gas milage

1974 fj40 stock w/30" tires.....one thing i learned real quick, aALWAYS TURN YOR RIG OF WHEN FILLING UP....it burns it faster than you can pump it in !!!!!

 

[Pin_Head]

2F

I went from 30 inch tires to 33s and then 35s.

My mileage on the highway varies between 11-15 MPG, before and after the mods.

The mileage depends mostly on which way the wind is blowing, how fast I am driving and whether I slip stream big rigs or not.