MPG comparison...How's yours?

[stony66]

Have a 66 short step with a 230 and turbo 350,3.07 out of 72 truck.Just got back from trip to Moultrie got 15.65 cruising 70 the whole way.Think I can fine tune and get a little better,think the vacuum advance went bad on trip.Oh yea,I have 235/75/15 tires on rear.

[sixTsix]

I would say mines about 2 gals to a mile. Tired ol 350, though it still runs ok ...don't smoke or used oil I know it drinks tha gas.

On a serious note though, the gas gauge is broke in my ride, so I'm only guessing. I just stop at stations and try to keep it on the full side. thank god for jiffy cans.

[BigDan3131]

I'll let you know once I get it sorted out but it will be a bone stock 6.0L truck engine with carb for now. My Powerglide because it still works just fine with a Boss Hog Convertor and 4.10 gears. To keep the revs down I'm going with a 32" tall tire on either 18" or 20" rear rims. I will be dropping it 3/4 and I have relocated the batteries and fuel tanks to the rear for better weight transfer.

1965 GMC Longbed

[66Submarine]

Originally Posted by sixTsix

On a serious note though, the gas gauge is broke in my ride, so I'm only guessing. I just stop at stations and try to keep it on the full side. thank god for jiffy cans.

Here you go.

[kieth]

Originally Posted by BigDan3131

I'll let you know once I get it sorted out but it will be a bone stock 6.0L truck engine with carb for now. My Powerglide because it still works just fine with a Boss Hog Convertor and 4.10 gears. To keep the revs down I'm going with a 32" tall tire on either 18" or 20" rear rims. I will be dropping it 3/4 and I have relocated the batteries and fuel tanks to the rear for better weight transfer.

here is a look at the performance after the proposed changes, and later with a 700r4

1965 GMC Longbed

*4:10------1:1(powerglide)------32" tires

1500rpm------2000rpm---------2500rpm----------3000rpm--------4000rpm

*35mph----------46.44mph------58.16mph-------69.66mph-------93mph

**50mph--------66.34mph-------83.mph------------99.51------------132mph


Kieth

**700r4

[sixTsix]

Originally Posted by 66Submarine

Here you go.

dude!! hell yea ...thats a great friggin idea!!

[BigDan3131]

The year after next the 200R4 will go in and a switch to 3.54 gears and then some shorter tires if I decide I want to drop it more than 4".

[Narxoleptic Customs]

283 w/ 600 Edelbrock/700r4/3.90/29" tire. Drove almost 1000 miles on the power tour and got 13 mpg!! Didn't play alot but way better than the 9 mpg we got last year...

[R_W]

Smogger 350 / QJet / TH350 / 3.73 in a '66 short wide. Getting 11.5 mpg. That is with no tuning, there is more to get for sure. I'll be hooking up a wide band data logger when I get it off of my other ride...

[pestwagon]

worn out 350 needing valve guide Badly (vortec heads) 200R4 and 3.73 posi 255/60/15 tires. gets 14 mpg all day on freeway doing 65 mph.1964 short fleet BBW. Was getting 8 mgg with leaky Quadrajet and TH350 tranny, then 9 .5 mpg with small Edelbroack carb and TH350, now using small Edelbrock carb and 200R4 tranny...

[61_FL_Apache]

I get around 10 with my 305/TH350 3.08 and 255/70/15's.

[Todd W. White]

1965 Chevrolet C-10 with a 283 bored to .060"-over, an RV cam, Edlebrock Performer Intake, Holley 4360 4-bbl Carb, Headers, SM420 Transmission, 3.08 Rear End, 29" tires.

Assuming little wind resistance -

In-town: 15-17 quite regularly. Got 17.4 this last time. By in-town, I mean freeway and city street driving, sitting idling at the drive-thru and intersections, etc.
Highway (60-65 mph with very few stops): 17-21, depending on if I'm hauling something, driving hard and fast, or fighting headwinds.

[trelogix]

66 short wide, 427 big block with Holley avenger efi,700r4, 3.07 rear end! 28" tires. Getting 11 to 12 mpg. Better than I would have expected!

[Greg63]

This past weekend I was getting between 18 - 20 mpg highway.
2000rpm (65mph) with a 327, my6 4 speed, 3.73:1 ratio rear gear, 285/50/18 tires.

Greg.

[corvettejim1968]

posted twice by accident sorry.

[Greg63]

This past weekend I was getting between 18 - 20 mpg highway.
2000rpm (65mph) with a 327, my6 4 speed, 3.73:1 ratio rear gear, 285/50/18 tires.

Greg.

[corvettejim1968]

230 in-line six stock 373 rear end 350 tranny 12.2mpg

[cru_zn_29]

My 66 C10 5.7 TBI 4L60E 3.73 rear gear 275/60/15 tire 16-18 around town 19-21 on open road 65-75.

[mattbert56]

im guna say bad. 1965 3/4 ton fleet w/ 292 inline 6 rochester monojet carb, HEI distributor, ported cast exhaust manifold, sm420 4 speed with a 4:11 in the back. wish i knew the actual millage, might test it out one day.

[ziplock]

My 64 averaged 28 mpg on my haul from Dallas to Austin. Only time Ive ever clocked it.

4 cly turbo Diesel, Sm465, 2.92 rear gears 235/75/15s cruising speed of 60-65

The first leg I drove 110 miles on 3.4gal of fuel

[66Submarine]

Neat. How's the performance with the 4BT and those tall gears + the SM465? I'd like to try a diesel if I come up with one I can afford at some point...

[ziplock]

Originally Posted by 66Submarine

Neat. How's the performance with the 4BT and those tall gears + the SM465? I'd like to try a diesel if I come up with one I can afford at some point...

Not very good. I lug badly into each gear. I changed the rears gears to get the thing above 50 mph. Wish I would have left them though, I picked up a NV4500 last week. It paired with some 3.73s will be perfect.

By the way, I couldn't afford a 4bt either. Ive got an oddball under the hood.
"3.7L Hercules diesel"

[dieseldude4bt]

24 combined average with a 4bt ranger sm420 and 4.10 gears running 285-75-16 at 60-65.
I have gotten as good as 30mpg from Grand Junction to Denver before but that is not an average.

[Irishbleueyes]

I have 283 edelbrock 500cfm (primaries leaned out as far as it will go), powerglide with 3:73 rear 235 75 15 tires getting 18 to 22 hwy but only 12 to 13 city. I do have 800 to 1000lbs of tools in the bed everyday and I can tell the weight is direct relation to mpg. When its empty it really moves out..

[66Submarine]

Originally Posted by ziplock

Not very good. I lug badly into each gear. I changed the rears gears to get the thing above 50 mph. Wish I would have left them though, I picked up a NV4500 last week. It paired with some 3.73s will be perfect.

By the way, I couldn't afford a 4bt either. Ive got an oddball under the hood.
"3.7L Hercules diesel"

Yeah, I figured that little diesel might want to balk at those gears with that wide-ratio trans. That NV4500 should be nice. Seems like a fairly interesting little engine, BTW.

Originally Posted by dieseldude4bt

24 combined average with a 4bt ranger sm420 and 4.10 gears running 285-75-16 at 60-65.
I have gotten as good as 30mpg from Grand Junction to Denver before but that is not an average.

Neat. I really like the idea of those little auxiliary OD transmissions for the split gears; does that combo do pretty well?