The Stovebolt Site Forums The Shop Area Engine Shop average gas mileage for 235?

Could any body give me the average gas mileage on a straight 6 235.

There would be alot of things that would factor into the answer, i.e. gear ratios, driving habits etc. However, I would guesstimate low to mid teens, at best, and on average.

i can give a below average on mine with dual carbs, dual exhaust, 2.73 rear end and a 5 speed. in town 9.5 on road 12.5. ron

I got 11.7 MPG with the old 235 and the rather short, original 4.57 rear end of my 3/4T.

I haven't measured it with the 261 and 4.10 rear end.

mine gets 15 to 20

Mine is a '50 3100. I have a 1956 235, coupled to a Muncie three speed. I have a 12 bolt GM Corporate rear end. I use Mobil 1 Extended Performance oil. I have Fenton headers, a Patrick's stainless steel dual exhaust, a Carter YF, MSD ignition, Magnicor cables, and a big size 15 1/2 right foot. The left foot is 15 1/2 too, but it has no impact on fuel economy!

I get a 14 MPG on the highway.

With the price of gas as it is I need to get going on that overdrive transmission!

I get about 4 or 5 MPG. Of coarse mine is in a 1 1/2 ton and I'm usually hauling 6 to 8 ton of gravel or dirt,
Scott

I can get 12 to 20, depending on my mood and/or load. Wind direction can be a major factor. 62 C-10 4spd 3.90 posi Longbed Fleetside.

55 1st series, 261, dual carbs, fenton headers, original hydra-matic, 3.90 gear, 28.5" tires = 12.7 mpg at 55 mph for 197 miles.

I have to get my odometer fixed then I'll know... but even if I get crap milage I'll STILL be driving my daily driver ol' Bolt!

6 cyls don't necessarily = economy. If thats an issue buy a Toyota.

I wish I knew, but just got my gas gauge workin on my 54 235, and my odometer says 433,321, if you can read those faded numbers..Who cares, just put gas in it, and drive your bolt,Steve..If my truck don't care, I don't care..First Light, me and my buddy are cruisin..Ya'll have a great weekend and if you aren't wrenchin, you should be drivin..Just me, part of the non-smokin bolters (we are really trying)...IT IS PAINTED..

Oh, by the way..the truck and I are going to the introduction of the new 2006 Harley lineup..and free beer and brats..Could even win another one..Hell, it's just across the road..I know my truck will make it that far, and will probably get VIP parking..I would send some pics, but there might be some wet shirts due to the front coming in from the SW..If Stupid doesn't forget his camera..There could be a front with protruding headlights..Next chapter.stay tuned

I get about 15 with my 261 around town with the stock 4.11 gears. I got about 20 with the 216, before it went to knockin. The Rochester could use a bit of tuning, the thing runs a bit on the rich side. When the milage drops down I know its time to reset the point gaps (I have a dual point distributor).

When my '54 3/4 ton was a daily driver, I was getting about 12 mpg city and 14-16 mpg highway.

If I pushed it over 50 MPH for any legnth of time, the fuel mileage went WAY down...

Stock 235, Rochester B, 3-speed, 4.57 rear, 7.50 x 15 tires.

Just drove my '72 C-10 long-box with 250 six, 3-sp, on a long trip (400 miles); kept my foot outta the carb (65mph or less) on the way down, and was surprised to actually get 18 mpg.

I've got a 235 powered 3/4 ton (1952) with 4.56 gears and I average between 13 and 14 mpg on the highway. Shockingly bad for a tiny little one-barrel carb, but I see everyone else gets around that too. As long as I don't commute in it, it's okay.

52 3/4 ton, 54 model 235 with M4F cam and one bbl, 4.10 gears, 31" tires with stock racks and ruuning down the highway at 60+. I get about 15 mpg.

Just made a trip to Kansas City from Denver. Got 18 mpg with a 57 235, bigger cam, single 1 bbl Carter YF carb, T5 trans. About 70 mph @ 1900 RPM. My guess is about 15 mpg around town.

Wow, great cruising rpm. My top speed is about 68 mph and that's around 3500 rpm. Must be the overdrive. What did you use for a bellhousing to mate the T5 to the I-6?

I used the original bellhousing from the 216. I also used a flywheel from a 261 and the 12 volt starter that was on the 235. This allowed me to keep the foot starter. Another reason for the low RPM is the rear end gear. I bought the rear from a junk yard. It was marked as a 3.73 out of a 65 1/2 ton. I think the gear is higher than that though. Boy did it come alive at the lower elevation of Kansas City. I think I need to rejet the carb. It runs a little rich at this mile high altitude. HRD, what carb are you using? Know where I can get jets for a Carter YF? I don't know which one I need yet though.

Anbody compare fuel mileage comparing a properly set-up YF Carter against a Rochester B on the same truck ?

Yes Frank. The Rochester got slightly better mileage but I had it jetted leaner. I need to find the right main jet for the YF. It runs a little rich. My guess is once I get the YF right they will be about the same.

so if you want to get decent mileage you should remove the 235 and install a 305?

Zenish. 305 for a 235. Blasphemy!

BTW. My 261 w/od & 3.31 rear end does about 2K rpm at 65. 18 mpg and running rich. Working on the jets this weekend. Currently have all the wheels off to check the balance and front wheel bearings out and back in for repacking.

Going to Goodguys in KC, MO on the 23rd.

we have a shop truck that is a 4.3/auto.its surprisingly fast and gets decent mileage.another possible choise.

Does anybody have any gas milage experience with the twin progressive 2 barrel Carter-Webbers Langdon sells? I read another post where someone was getting in the low 20s with the 5 spd o/d, open diff with highway gears, twin two-barrels and HEI.

My '72 with a 350 and an automatic with 3.5-something gears gets about one mile per gallon better than my '55 1st with a GMC 270, SM420 and 3.08 gears.

My other V-8 powered truck averages about half what the '72 gets, but it has a 454 and 4.11 gears.