What mileage to expect

[gerry giordano]

Can't use the search for now so I'll ask what's probably been asked many times before: What kind of milage can I expect from a 350 in one of these that's set up pretty much stock? Is there a great difference between those with automatic and those with a stick? Seems like automatics are the more commonly found too.

Thank you.

[68 Suburban]

A lot will depend on what rear end you are running and what type of driving you will be doing.

[StingRay]

I have a 350 with stock compression, a mild cam, 194 heads, q-jet, K&N air cleaner, MSD 6a, curved dist with adj vac adv, performer intake, Z28 oil pan with windage tray (worth a few HP and wee bit of fuel economy), Clutch fan, rams horns with 2" duals running turbo mufflers and I have a turbo 350 with a 3.73 rear end. I get about 12.5 MPG (US gallons) at 70 MPH. I also get the same at 65 towing an unloaded 2500 lb flat deck and about 10 hauling the same trailer loaded with half a truck. Not sure what I'd get at 60 but it would probably be about 13 or 14 MPG. A 3.08 would really help on unloaded cruising as would a 700 R4. Hope this helps.

[71-longbed]

see below for my details...i'm pretty sure i have 3.08's in the rear ..the best i've gotten on the highway is 16mpg .... around town probaly 10 or 11 .... all depends on how planted your foot is

[Phillip Johnson]

Ive had several of these trucks. the best I ever got was 16mpg stock, 350 350/turbo with a quadrajet.
I have a 71 with 350/350 turbo with a quadrajet and all Im getting now is about 12 mpg. I have yet to do anything under the hood except check the oil. I think I can pull a good 15 out of this truck with a set of plugs and bump up the timming.. Just my 3.7 cents worth

[OneMpg]

I do mostly around town driving and I'm getting between 8 and 10. I dunno if this helps you at all because my 350 isn't stock. All the performer crap, Doug Thorley's, etc. I have a 4spd, but I think the reason my mileage is so bad is because my rear end is geared too high. I'm not sure what's in there, I will have to pull the cover when I get a chance but I definitely need lower gears. Hill starts can be real tough in second. I've actually been using my granny on hill starts. I want posi too so I may just swap in a Dana 60 with a detroit. I haven't really had a chance to calculate freeway mileage since I got it dialed in but I'd guess it's pretty descent because I run real low RPM's at speed. I think it's about 2500 at 65 or so.

-Dave-

[Huck]

16mpg around town---20-22mpg highway.
350 crate with:
Edelbrock Carb and intake
HEI
Headers
307posi
5 speed out of a 96 Silverado
If I keep my truck and drive it 20,000 miles per year, in 2007 the 5 speed will have paid for it's self!!

[nroden]

I have a 72 with a all stock 350 and TH350. Original rearend also. Orig. QuadraJet, replaced the timing chain, ignition, plugs, ect. all with stock. Nothing major ever done to it. I get about 12-13 MPG. I am wanting to do electronic ignition though and maybe get the carb rebuilt and tuned up or get a new Edelbrock. Toneau covers also can help!!!