Bobzilla wrote:yamaha wrote: Wait, I thought the point of a gas truck was to consume multiple dinosaurs per mileNo, the point of my wife's truck is to sound glorious and look pretty while cruising the highway effortlessly.
IDK, mine is the "Revenge against subaru owners" truck......or it will be after I hack the muffler off. Oddly enough, I doubt milage will be any different as to either driving it or towing a 10k lb trailer....
carguy123 wrote: Get a new truck.Yesterday I made a 150 mile run across DFW on a mix of highway & city streets and maintained 24.2 mpg in my full sized 2011, V8, F150. This was based upon the electronic mpg gauge in the truck. In 2012 they got cylinder deactivation which would increase the gas mileage. Regardless of the driving style or mix of city streets vs. highway I almost can't fall below 20 mpg. And yes, it will tow.
Dad has a 2003 F150 Crew cab, almost NEW 5.4 (replaced maybe 10k miles ago, gotta love jiffy lube) and the best either one of us can get out of it is 19, and that is babying the hell out of it. It didn't change any with a narrower taller tire, that's just the best it will get.
yamaha wrote: Wait, I thought the point of a gas truck was to consume multiple dinosaurs per mile
Yep, I burned a Trex, two velociraptor, and a pterodactylus today. The pterodactylus did cause a bit of a misfire though so I don't think I'll be getting any more of those. 
carguy123 wrote: This was based upon the electronic mpg gauge in the truck.
snicker
I'm not sure what engine you'd want (400 SBC with a really cold cam sounds right), but I know what gearbox you need.
ZF6 six-speed out of an LT1 Corvette. Way slicker-shifting than the later T56.
Toyman01 wrote:yamaha wrote: Wait, I thought the point of a gas truck was to consume multiple dinosaurs per mileYep, I burned a Trex, two velociraptor, and a pterodactylus today. The pterodactylus did cause a bit of a misfire though so I don't think I'll be getting any more of those.
Mine requires T-Rex's only.........its a PITA to be honest
chaparral wrote: I'm not sure what engine you'd want (400 SBC with a really cold cam sounds right), but I know what gearbox you need. ZF6 six-speed out of an LT1 Corvette. Way slicker-shifting than the later T56.
And you are forced to use a pull-type clutch which sucks balls for any kind of holding. TERRIBLE idea for a truck that is going to tow.
yamaha wrote:Toyman01 wrote:yamaha wrote: Wait, I thought the point of a gas truck was to consume multiple dinosaurs per mileYep, I burned a Trex, two velociraptor, and a pterodactylus today. The pterodactylus did cause a bit of a misfire though so I don't think I'll be getting any more of those.
Your truck is just meaner than mine. Must need a little attitude in the tank.
In reply to Toyman01:
stupid v10......
Two data points:
1983 1/2 Ton Chevy Suburban, 2WD, 350, 700R4, 23-25 MPG highway. Acceleration when towing wasn't anything to brag about, but 3rd gear would work very well when towing on the highway.
1989 1/2 Ton Chevy C1500 (regular cab, short bed), 5spd, 3.08 gears, 26-27 MPG highway. I never towed with it, but it did have a bunch of low-end torque, and probably would have done OK with say 4,000 lbs.
You can get a Corvette T56 with a .50 Overdrive, I would imagine you could do very well in terms of mileage with any LSx engine, provided the appropriate gearing.
What engine was in the 89? That's getting near where I want to be mileage wise.
The truck forums generally frown on the T-56 for towing.
The '89 had the 4.3L V6. In a relatively light truck like that one, it did pretty well. I never felt like it needed a V8.
500" caddy
t56
3.08
mpg
there's a formula in there somewhere. torque out the ass to overcome the gearing, but the .5 6th ratio puts you with an effective rear gear of 1.54 on the highway, and the caddy motor wouldn't lag at 900rpm on the highway because it has 25,000 torques off idle
patgizz wrote: 500" caddy t56 3.08 mpg there's a formula in there somewhere. torque out the ass to overcome the gearing, but the .5 6th ratio puts you with an effective rear gear of 1.54 on the highway, and the caddy motor wouldn't lag at 900rpm on the highway because it has 25,000 torques off idle
I think that's too much air to feed, at some point, you do have to put a certain amount of fuel into a certain size of engine.
I think a 350 chebby is the way to go. I'm going to test some hypothesis this year after my tq's thread from last year. The big thing is that right now, I don't think my truck is at it's optimum for mpg (300,000kms on a 93 gmc does that) and am debating how much money is worth putting into it.
I had a '79 C10 with a 250 I-6 and a three-on-the-tree. It would regularly knock down 22-25mpg. I bet if it had an overdrive trans, I could have hit 30 highway.
Oh, and it would tow 5000 pounds, just a bit rough on the clutch.
patgizz wrote: 500" caddy t56 3.08 mpg there's a formula in there somewhere. torque out the ass to overcome the gearing, but the .5 6th ratio puts you with an effective rear gear of 1.54 on the highway, and the caddy motor wouldn't lag at 900rpm on the highway because it has 25,000 torques off idle
You could almost do that with any of the big blocks, except I would have a modified 460 and 2.73's in an 8.8.
Hence why I was thinking about a 383 vs 350, the extra cubes and stroke should bring some more torque's to the party.
I really like the idea of 4wd not that I'm into wheeling all that much, but it's nice to have it when you need it. Got to digging around a bit, apparently the IFS from the 99-03 4wd trucks are a 7.2 diff, and there is a 3.08 R&P available for it. Which means, a 4wd truck with matched front and rear with long legs is possible. http://www.ringpinion.com/b2c/ProductDetails.aspx?ProdID=871&Product=GM_7.2-308&Brand=General_Motors After some more digging, the gm big blocks and diesels from 2001 to I want to say 2005 used the S6-650 Six speed, granny first gear, .72 OD gear, http://www.dieselhub.com/trans/ZF-S6-650.html So, a bolt on OD manual trans, that's built to handle 650ft lbs stock shouldn't even be phased behind the motor I'm thinking of using/building.
HiTempguy wrote:patgizz wrote: 500" caddy t56 3.08 mpg there's a formula in there somewhere. torque out the ass to overcome the gearing, but the .5 6th ratio puts you with an effective rear gear of 1.54 on the highway, and the caddy motor wouldn't lag at 900rpm on the highway because it has 25,000 torques off idleI think that's too much air to feed, at some point, you do have to put a certain amount of fuel into a certain size of engine.
True, but volumetrically speaking, the 500 potentially does more with the fuel it has. More surface area (which suggests more parasitic losses) but they typically only rev to 4000. Since friction is the square of speed, carry the two, etc... they often do very well.
I had a 500 in a 66 Bonneville with 3.73s, TH400 and a GVOD. Consistent 18+mpg... until I realized that my speedo/odometer was off a bit... which meant 19-ish mpg. I imagine with 3.08s I could have pulled off 24+.
With a truck, though, there is no escaping the fact that you are driving a billboard into the wind. Getting mid 20s in a pickup isn't easy
... at least without diesel
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