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View Poll Results: What's your MPG?
Less than 7 MPG...I should own stock in the oil fields. 33 6.48%
7 to 9 MPG ... can I get some gas money please? 86 16.90%
10 to 12 MPG ... And I thought I had it bad...look at those suckers getting less! 198 38.90%
13 to 14 MPG ... Yeah... I'm doing OK 103 20.24%
15 to 17 MPG ... Heh...I'm doin better than the new trucks! 60 11.79%
18 to 20 MPG ... Why does everyone say B.S. when i tell them this???? 20 3.93%
20+ I am a compulsive lier and I am stoned. (j/k if anyone here actually DOES do this good.... or if you are a lier and a stoner and feel insulted) 20 3.93%
MPG... Whats that? I get KPL and it is so wierd that you americans never seem to be able to figure it out. 12 2.36%
Multiple Choice Poll. Voters: 509. You may not vote on this poll

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Old 05-30-2008, 10:08 PM   #101
Mt Man Chad
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Re: MPG poll

I voted 18-20MPG. I just broke the motor in 9.5:1 flat top pistons, Clifford 264 cam lightly ported head and had 17 MPG.

I'm still tuning the carb it's running a little rich and yet tweek the timing. It should get me to at least 19MPG with the additon of synthetic gear oils in the diff and trans.......
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Old 05-31-2008, 03:27 AM   #102
red71cheyenne
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Re: MPG poll

Quote:
Originally Posted by Ackattack View Post
I got 18.5 mpg out of my 72 GMC LWB. It was running a TPI 350, 700R4, and 3.73gears. It also had headers, 2.5" exhaust and a few other things. Nothing wild though.
What size injectors are you running? I have 24lb/hr in mine and 15 on the hiway is the best I've ever gotten.

Sounds like the 6 banger is the way to go though!!
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Old 05-31-2008, 07:42 AM   #103
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Re: MPG poll

I,m getting 10-11 in my '67 GMC w/a stone stock 305 V-6, 4-spd. manual trans. and 4.10 gears in the Dana 60. It sits on tall, skinny 235/85R-16 tires aired up to 55 psi.
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Old 05-31-2008, 08:56 AM   #104
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Re: MPG poll

13.5 when I checked it about 4 months ago. But when I get that bumper back on, things will be different!
I pulled the rear bumper to get it painted (a month and a half ago!) and as soon as I finish the frame, the engine will go back in! Hell of a lot of work just to get a bumper painted!

72 K10 350, sm465/np205, tires-31 , 3.07 gears.

Currently adding Edelbrock 1406 & Performer intake and removing smog equipment.... hope it helps!
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Old 04-11-2010, 11:28 AM   #105
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Re: MPG poll

The 572 running on 87 got 7.5-8.5mpg going across the USA. Like most big blocks it didn't care that it was loaded with 1,500lbs of stuff, going uphill or down, 100mph or 60mph...
Ah the joy of consistency.
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Old 04-11-2010, 12:05 PM   #106
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Re: MPG poll

The truck's last fill-up netted me 7.5. Blech. I need to tweak that QuadraJet some more.

The Econo-Boat can get 24+ in strictly flat highway cruising with no wind, but the usual mileage to and from work is 19-21.
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Old 04-12-2011, 06:56 PM   #107
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Re: MPG poll

I have a 1967 C10 with a 350 four barrel carb and a 700r4 tranny. I have 3.77 and 15 inch rallys on it. If I keep my foot out of it I get about 15 around town and as much as 18 on the hwy. I think the tranny helps a lot.

It did cost me $50 bucks to fill up the other day WOW!!!! Times have changed!!

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Old 04-12-2011, 07:24 PM   #108
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Re: MPG poll

Quote:
Originally Posted by vexvader View Post
I have a 1967 C10 with a 350 four barrel carb and a 700r4 tranny. I have 3.77 and 15 inch rallys on it. If I keep my foot out of it I get about 15 around town and as much as 18 on the hwy. I think the tranny helps a lot.

It did cost me $50 bucks to fill up the other day WOW!!!! Times have changed!!
That's excellent fuel mileage! I have never come close to that...

$50 doesn't sound all that bad, though... if I had to fill my three tanks at once (which I have done before), at today's prices here it would be over $200.
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Old 04-12-2011, 07:39 PM   #109
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Re: MPG poll

250, 700r4, 3.03, hei and I don,t drive hard at all. I'm happy with 15-17 mpg.
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Old 04-12-2011, 07:53 PM   #110
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Re: MPG poll

20.5 hyway 16 town if I keep thy foot out of it..
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Old 04-12-2011, 09:33 PM   #111
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Re: MPG poll

Been getting 15-17 in my 65 with 305, 700R4 and 3:83 gears.

I have wondered for a while now (since I am starting to collect parts to build my sons 71), if one wanted to REALLY build a hi-MPG truck, how high could you expect? For example, a short step (I presume this would be lightest), replace frame with tube frame (privided one exists), get rid of all excess weight (aluminum wheels, fiberglass fenders & hood, no bumpers, etc) , put in 3.07 gear, 700R4 and LS1 (keep foot out of it)...could you get 20+ in our trucks?
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Old 04-12-2011, 09:38 PM   #112
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Re: MPG poll

Ive never checked my mileage on my truck or my Scion. I always figured why bother, Im driving both no matter what. Oh, plus the Scion is a company car and they pay for all the gas.

And I did notice this is a very old thread =)
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Old 04-12-2011, 11:54 PM   #113
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Re: MPG poll

Looking at this makes me feel expensive. I get about 9 miles to the gallon without the top and the original 350/350 combo.
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Old 04-13-2011, 07:11 AM   #114
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Re: MPG poll

Here's a graph I did of fuel economy. The (ADJ. 1.08x line) refelects a calculated 85 inaccuracy in my speedometer and odo readings:
Attached Images
  
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Old 04-13-2011, 10:19 AM   #115
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Re: MPG poll

I'd like to see a test done on mph with real gas
and then the e10 at the pump..
to see just how much you loose with the e10 over 100% gas..
as I think the ethenol is nothing but a bunch of green B/S
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Old 04-13-2011, 10:38 AM   #116
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Re: MPG poll

2wd w/ 454 and holley 600!

Edit: Less than 7 I get about 6MPG's on this beast.
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Old 04-13-2011, 10:47 AM   #117
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Re: MPG poll

I'm running a fresh 307, Edelbrock 650 carb, 700r4 and 4:56 in the rear. If I keep it at 65 and the wind isn't hard in my face, the best I've seen is 15.3 mpg.

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Old 04-13-2011, 01:37 PM   #118
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Re: MPG poll

Look at that monster in my avatar
"It's so cool I don't give a damn about fuel"
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Old 04-13-2011, 01:55 PM   #119
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Re: MPG poll

Quote:
Originally Posted by jimmydean View Post
Last time I checked (I try not too very often) I was getting close to 15 on average. Low mile motor, Edelbrock intake and carb, HEI with good wires, plus I try to keep my foot out of it whn I can.

Now that we have E85 near by, I will be converting my fuel pump and lines. $.20 cheaper a gallon baby!
E85 isn't near as efficient, and needs higher compression to utilize the slower burn. FYI
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Old 04-13-2011, 02:02 PM   #120
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Re: MPG poll

I get 16.1 hwy if I drive nice. 71 LWB 350 vortec heads, volvo penta marine manifold, edelbrock 600cfm crower beast cam .462 int .470 exh 218/216 @.050 112 degree lsa, th400 trans, 3.73 rear gear, 65k HEI, and 29 in tires. hoping for 20 mpg with FI and a 4l60

Last edited by BIGKEV; 04-13-2011 at 02:11 PM. Reason: typo
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Old 04-13-2011, 02:04 PM   #121
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Re: MPG poll

Quote:
Originally Posted by stich626 View Post
I'd like to see a test done on mph with real gas
and then the e10 at the pump..
to see just how much you loose with the e10 over 100% gas..
as I think the ethenol is nothing but a bunch of green B/S
Agreed, I read it takes 1.2 gallons of petroleum to get 1 gallon of E85 to the pump.
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Old 04-16-2011, 05:05 PM   #122
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Re: MPG poll

I get about 10 IF I can keep my foot off the go fast pedal.
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Old 04-16-2011, 06:47 PM   #123
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Re: MPG poll

I get about 8mpg with my 71 4x4. 454ci bored .030 over, comp 4x4 extreme cam, Cloyes true roller timing chain, Rhoads lifters, Crane full roller rockers, Edelbrock intake,750cfm Weber 4bbl carb. Good thing it's a toy and not a daily driver!
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Old 04-16-2011, 09:44 PM   #124
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Re: MPG poll

I get around 11 mpg based off the speedo, but the speedo is off so its probably getting worse than that. 355sbc, 292 competition cam, around 10.5:1 compression, holley 600 double pumper, and 3.08 gears (for gas mileage, its my daily diver) I swear I can see the gas guage move everytime I hit the gas, but it does get great smiles per gallon.
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Old 04-16-2011, 11:40 PM   #125
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Re: MPG poll

Aloha
76 2bolt main 350 with edelbrock carb intake cam package. th350 trans 3.08 auburn posi. 20 miles one way to work and 20 miles back approx. 6 miles city stop and go and the rest 55 mph, and with out ac running. All in my 72 GMC cut down long bed.
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