> What is your MPG ?

[trac209]

I agree with Special K I'm sceptical as well to some of the mpg numbers thrown out there as well.
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[CC69Rat]

Stock 350/255hp, Edelcrock 1406, Performer RPM and ramhorns 3OTT, unknown rear gear. (guessing 3:73) ~22mph if I take it easy on the freeway. 55-60mph

[haysonj]

At $5 a Gal for premium in California mine gets 0 as it never leaves the driveway. Towing the boat it would get around 12 Has a FI 383/T400/GV overdrive and 4:09 gears. Also has 35 in. tires

[Clrussell]

4mpg or less.. Drove it on a 70 mile round trip and used about 17 gallons of fuel.. That's highway driving too.. But it was worth every drop of fuel it burned! (355 tune port 10-1 compression dart heads etc, 4 speed, 4.56 gears, 41" tires)
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[Sideways]

Originally Posted by Secret Squirrel

People rag on me all the time for driving these old gas guzzlers, and that is always my answer. Taking the kids with you increases the smiles per gallon 10 fold.

You said it,it really is about the "smiles" per gallon.

[bbadfred]

67 short bed with 2003 LQ9 6.0 with Speartech harness and reprogrammed PCM 4L65 3.50 rear gear 26" tall rear tires. 15-17 mpg around town and short trips, depends on how much and how hard you leg it! 120 mile combination road and town driving with a light foot 17-19mpg. Looking forward to a long road trip to see what it will do highway only.

[Sicklajoie]

I get anywhere from 11-13mpg

[Fitz]

Originally Posted by GRX

Gas! ... How many miles per gallon do you get with your classic truck?

List truck type and drive train if you please

It's no classic any more. It's a beast.
67 Stepside
Z572
620 HP
650 ft-lbs torque
4.10 rear
T400 Trans
0.7:1 Overdrive
If I cared about MPG I would never have built it this way.

[Rob H.]

When I had my 307 in it with sm420 4 speed and I think 3.07 gears and 30 x 9.5 tires, I was getting 15.5 at my best, mixed local and highway driving. I'm not sure how it will do with the 327 and the same setup.

[allchevy58]

Mine gets 14.2 to 14.7 empty. 350/350 4:10 rearend. Odometer may be off a little too.

[54Caddy]

350/700r4 no lockup. 3:07 rear gears 26.5 tall tires. rv cam, 64cc heads, 1406 carb, performed intake. I get 11.5 on the freeway doing about 55 60. I dont know why so little its bugging me. Started working a few towns away i clearned 120 last week on gas.

[68corvair]

Gee, why all the doubt ? I use my gps for miles traveled , and check mpg's pretty often.
I use the lockup on the tranny , it has stock size tires (skinny) the edelbrock is a1407 tuned for mileage.
If you think thats hard to believe,I guess you will think I am nuts when I tell you my other ride,a 68
Chevy corvair,with a hot motor got 24.5 on my recent trip to Detroit,2000 miles round trip,oh yeah it is fuel injected/distributorless ign. (: Ed

[bgwss]

I have a 351 V6 3/4 long bed. I am unsure of the rear end but I get 8.6 mpg. I would love to get 15.

[69GWC]

69 4x4, 350 4sp, 373 gear, has a 670 holley, street dominater, MSD HEI , MSD wires Headers unknown cam/compression with 31 tires.

Around 25mpg on the highway doing 65mph.









































Lol, think its getting around 12mpg
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[in deep 72]

72 Blazer, 468 BB/350/205, 4:11 gears, 11" of lift and 39.5x18.5 Boggers. Drains a tank in 80 miles (bout 4mpg US). Hate to think what it's going to be after stroking it to 496 and switching the gears to 4:88....but it's not built for economy . just too damn much fun to worry about mileage. Might need to get a bigger tank though.

[bollybib]

When I got mine to the driver stage in August 2011, I started keeping detailed fuel usage records. As of today, I've gone 6877.3 miles and used 652.1 gallons which averages out to 10.5 mpg. I've gotten as much as 13.5 mpg and as little as 8.5 mpg during that period.

Using Southern California regular gas, the cost averaged out to $4.087 per gallon over the same period which means I spent $2,665.00 on gas !

[Tshort1]

When I get mine to where its drivable I will let you know. 67 SWB, mild 327/700r4 with a 2200 stall, 373 gears. Im guessing between 10 and 15 MPG And I will love evey mile I drive it even if it gets 1 MPG.

[mrein3]

Originally Posted by bollybib

When I got mine to the driver stage in August 2011, I started keeping detailed fuel usage records. As of today, I've gone 6877.3 miles and used 652.1 gallons which averages out to 10.5 mpg. I've gotten as much as 13.5 mpg and as little as 8.5 mpg during that period.

Using Southern California regular gas, the cost averaged out to $4.087 per gallon over the same period which means I spent $2,665.00 on gas !

I don't have my log in front of me but I too keep VERY detailed records of fuel consumption. My numbers are similar. My very best ever was 13.5 when I went about 100 miles, unloaded, with a tail wind. I had a 3-speed manual, 350, 2bbl carb at the time. 3.73 gears, stock height (28.5" or so) tires. Single exhaust.

Now the same 3.73 gears are propelled by a 383 with a 4bbl Edelbrock 1406 through a th350. Dual exhaust. Not much has changed other than I never see 13.5 any more which is probably due to the slip in the th350.

A funny note on the th350. When I went with a turbo 350 verses a 700r4 I calculated fuel prices UP TO $1.799/gallon. I figured the higher cost of the 700r4 wasn't worth it because I'm usually pulling a boat (wouldn't use OD then) and don't drive it much where I'd really need it (70mph on the slab). Back then I never imagined $4 gas.

FWIW, I'm highly skeptical of anybody claiming anything over about 15mpg. Maybe 17 mpg with a 2wd and highway friendly rear end gears or an OD tranny.

If your speedometer doesn't match a GPS, your numbers are worthless and should be noted in your mpg guess.

[bollybib]

I haven't compared mine with a GPS (since I don't have one) so I am reporting what the odometer says without any correction. I think I figured it out one time that my odometer could be in error by 10% or so, so in that sense you can consider my figures ballpark.

[Stocker]

Originally Posted by mrein3

If your speedometer doesn't match a GPS, your numbers are worthless and should be noted in your mpg guess.

Before GPS came along, you could compare your odometer to the mile post markers that are on many highways.

Come to think of it, that system still works.

[scotteric]

68 c20 long bed
350 / 4speed
Ho52/4.56
MPG = FEW

[mrein3]

Originally Posted by Stocker

Before GPS came along, you could compare your odometer to the mile post markers that are on many highways.

Come to think of it, that system still works.

I agree but big government has a GPS chip in every phone now and most of them are smart phones. I got a free application in my ipod phone that has a speedo based on GPS. In fact, I wonder how the Garmins, etc. are staying in business.
But yes, if you set your speed at 60mph, and pass from one mile marker to another in exactly 1 minute, your speedo is on.

However, if you're splitting hairs, I'd trust a GPS over the watch/60mph trick any day.

[Lemield]

My 70 short fleet with a 383 and Gear Vendors Overdrive and 3:73 gears gets around 14-15mpg, a little better on the highway.

My 70 C20 big block gets 9-10 MPG no matter what.

My 71 K20 with the 6.2 diesel gets 17-18 mpg around town...don't know about highway yet...

[Classic69]

'69 Longbed with a SBC 283/TH350, K&N air filter, headers, 3.73 gears....

I get around 12-13 MPG (combined)