gears and gas milage/whatcha got?
 

what gear in the rear is the popular for gas milage ,what tranny is the favorite of my fellow truckers.
i run a 350/350turbo with 3.73 gears ,its allright for back and forth to work and local drivin and will snatch your head back into the rear window !!! but........... if i do have to get on the interstate it sounds like i am running @ Daytona. and the gas gauge falls rather quickly$$ i am building a new rear end w/3.08 gears,hoping not to sacrifice my boogidy,bogidy for better milage.
lemme know what yur running and how good is your milage/ btw i get bout 10 miles to the gal.
mr magoo

4.10s, 33" tires, 8-9MPG stock 350 running a little rich.

3.73 gears. 350/th350. 9.5 mpg most of the time towing my boat. 13 mpg was my best ever. That was not towing and I had a good tail wind.

4:10/200R4/275:60X15tires and i git 16.5mpg running 70-75 on the highway about 10-11 around town

350/TH350/3.07. Usually around 12-13mpg on premium fuel...but my motor is built a little and i have a lead foot.

My son's truck is the one we use mostly and it has a 307/TH 350
with 3:07 gears. Gets 16 mpg.

Jim

327/3spd manul/4.56 gears on a 3/4 ton truck with some 8 ply mud grips.....maybe 8 MPG

K/20 - 350 w/ quadrapuke, 4sp, 3.73 open, 31" tires gets 10 mpg full, empty, warm, cold, north or south.

K/5 - 350 w/ 750 Holley, TH350, 3.08 open, 31" tires gets between 9-10.

Both 4X4's

350/700R4/3.08 and I get about 12-13 MPG but I can't use the overdrive around town because in overdrive the engine only turns 1000rpm at 55mph. I haven't check the mileage on the highway yet. I need to get a 3.73.

350 4bbl 4spd 4.10 rear. I get about 10mpg. Without an overdrive I'm turning some rpms on the freeway. I'm thinking of putting a 700R4 in the truck to get overdrive.

3.0's and a ZZ502=no gas mileage.

Working on it:
Was getting 10.4 on the highway, working on the carb and timing last trip I got 12.6. I'm hoping for 14, but my tires are too short I think. I'm running 295/50/15 now. Will be running 275/50/17s by summer hopefully. See sig for engine/drivetrain combo

402 - 700R4 - 3:73posi - 31's
13.5mpg towing around 4500lbs.

Shortbed/ stepside/ 250 6cyl/ Tremec 3550 5-speed/ 3.73 gears/ 235-75-15 tires
15-17mpg around town
18-21mpg highway

327/350/3.08 I have 255-70/R15 Around town I will get ~13. On the interstate running 75-80 (2800-3000rpm) I will, once again, get ~13.
If I do like 55 or so and keep my engine down at like 2300, then my mileage climbs ( but who wants to go that slow :crazy:

68 C10 burb, 350, 4 speed, 3.07 rear, 31" tires, 18-19 mpg highway, 15-16 locally.

K10, 427 with a 700R4, 4:10 axles with 33" rubber. 9 mpg in a headwind, with a tailwind, uphill, and downhill.

1972 C10 355 10.-1 3.73s 276/50r15 tires Gets about 2300 at 50 and 3300 at 70 its a miracle to bust 10mpg

350 cid, Turbo 400, 3.08's in the rear, lead foot = about 11-12 mpg...

with a 350/TH350 3.73 gears and 26 inch tall tires i get around 8-9 taking it easy. i don't want to know what it gets when i put my foot into it. but who cares about gas mileage when you got power!

350
3 speed stock tranny
3.73 gears
255/60/R15 tires
2bbl carb

12-13 mpg in town
18-19 mpg highway

i think that might be outperforming some of the new SUVs out there!

;) jewels.

1972 step 383/350/3.08 (I think)
10 mpg city, 13 highway running 75-80 at 4000RPMs

and yes jewels you are, Our 2002 Dodge Durango with 5.9 and auto only got 12-13 highway. My wifes new 2003 audi a4 quattro with 3.0 only gets about 18-21mpg, but I have a lead foot!!

I still have a bunch of question marks. I don't drive crazy like alot of people here do, I only go to about 2500 rpm and thats it. According to the p/o, the original 4.10's were swapped for 3.73's.
'73 stock 350, SM465, 3/4 ton 4x4...and I swear that I can get close to 18 on long highway trips, If I keep my foot out of it (which I usually do). But, since I never go on long highway trips in my truck, I never get that good of gas mileage. I'd guess 14 or 14 on the highway to and from work and school, and around 10 in town.

Here's how much of a grandpa driver I am- I consider opening the Qjet's secondaries a special occasion, that rarely happens.

Mileage
 

1972 Suburban C10 2wd, late model 350, edelbrock carb, vortec heads, headers, TH700, 3.07 gears, mostly highway with some city driving, 14.7 mpg

'70 k10 350/sm465 35inch tires dual quads= i dont want to know
probly 5-10mpg