Ultimate MPG 12V Build?

Red Stroke said:
So who has the best combo and what are you using?

I was thinking:

95 12v 160 Pump
Stock Turbo
5x.012 Sticks
022 DVs
Stock head bolts lubed with moly to 135 ft/lbs
18 degrees timing
3k gsk or washers
Some type of cam plate

Auto trans
3.73 gears
295 tires
7200 lbs

What 22 mpg and 325 hp to the ground maybe?
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I think 3.55s for sure, maybe even 3.08s. A manual transmission would yield the best mileage, but if its an auto a good tight converter would help too. Keep the stock DVs, and go to 20* with the timing.
 
Hurley said:
start dropping weight
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That's the only way I can explain me getting 22mpg with the 370's and not running OD (messed up the selective shim/spacer combo <- part of the reason it's torn apart right now). My truck weighed 5600# with a 200# bumper up front, me, and a 1/4 tank of fuel. I would put it somewhere closer to 5500# now that I swapped a sport bumper in up front.

Not to mention the 16cm housing on my HX40 only pushed 4psi of boost at 65-70 turning 2500 rpm...

Weight, aerodynamics, and boost are all killers of mileage :Cheer:

94-95 rclb
auto or stick (your choice, but an aftermarket TC and VB would help)
2wd (leave the ride height alone but build an air dam like crabbelle)
topper or hard bed cover
215's or a good set of EDMed sticks with the .020 washers
19* timing
plate of your choice
Stock DVs
3kgsk or washers
235/85R16 tall and skinny
keep the 3.54s
Choice of HX40, 16.5 cm housing on stocker or aftermarket with a 14cm housing (want to keep the cruising boost as low as possible)

That would be my personal set up for a cheap DD that should at least get out of it's own way, yet still get decent mileage. The thing I like to keep in mind about the auto is that it has a .69 OD vs the .75 of the 5spd... I know it's not much of a difference, but it all adds up.
 
will the 16cm housing on a stock hx35 make it bog off the line to much or is it not noticeable? can't get but 16-17 out of my truck running empty. was thinking of trying a 16cm on it.
 
K204DR said:
will the 16cm housing on a stock hx35 make it bog off the line to much or is it not noticeable? can't get but 16-17 out of my truck running empty. was thinking of trying a 16cm on it.
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16cm will help on a stocker. I liked my 18.5

If you like 0 crusing boost at 65mph.
 
I would think driving habits and timming would be 2 big things when trying to get mileage. Now, why is it that I hear so many different timming settings? Anything from 15.5* to 20*. That's a big difference. So far, I've ran stock timming, 17*, and 15.5. I have yet to notice any difference between the 15.5* and 17*. Both only give about 16-17mpg in town and about 20-21mpg HWY.
 
Macktruckdriver said:
my stock Dually gets 20 but 30-34 just and happinin
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STOCK being the key word here. These motors respond very well to mpg when the correct mods are added. I read up on Crabbelle's thread awhile back, and have been reading up on Garmons 55 mpg wonder machine.

Am I skeptical, yes. Do I think it's possible, yes. Do I think these guys are simply blowing smoke up our ass with those mpg numbers they've given out, not at all.

No two trucks are the same, no two motors built exactly alike will act the same either. Tuning, tuning, and more tuning.

Personally, my truck gets 18 mpg. I want it better, and will tune and tweak to get more out of it. Eficient motors make more power, and are more economical, which in turn translates to better mpg.

Anyone that call's BS on a claim like 30 mpg, or even Garmons 55 mpg, I want to see the proof WHY it CAN NOT get the claimed mileage. Physics and engine theory withstanding, I feel no reason to discredit the two numbers I've given here.

Sorry for the thread derail. I'm all for making efficient, economical power, while still having fun. Post up more combos, I will be reading.
 
well I swapped my 16cm housing on this morning. going on a roadtrip soon so we'll see how it changes things. was getting 13-16 last weekend on the way to Fla with my trailer.
wheres a link to the build thread on the 55 mpg truck?
 
I average 15.5 to 16 mpg mixed driving. If I baby it around town a purposely try to save fuel, I can break into the 18's.

Before any mods and with a new VP44 rolling on 265/75/16 Michelin's I averaged 21.5 mpg at around 2400' elevation.

Moved to Utah 4500' valley floors, mileage dropped to 17.5 mixed driving.

Added Jammer 5's, Edge Comp, Intake and Exhaust and mileage dropped to 14.5-15.

Moved to Vegas 2000' elevation and mileage came back up to nearly 16.

My truck has been in the great fuel economy range, average, and poor. Mods, elevation, and driving habits have a HUGE effect on fuel economy. I set cruise control at 62 mph and drove on the 75mph interstate from Utah to Washington non-stop. 760+ miles on less than 29 gallons. Came out to 24.4 mpg or so. That was rolling on 35" mudders, edge comp, stock injectors, stock exhaust, and maybe my K&N intake. That's the same setup that was averaging 17.5 mpg mixed driving.

I believe 30 mpg is attainable, but who wants to drive that slow all the time with an egg under their foot?
 
Red Stroke said:
That was always one swap I wanted to do, I dont know what those get for mileage 20 to 25? If that is all then I would rather have a 18-22 mpg F-250
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Ive gotten 27mpg driven my truck around town. The trans doesnt have lock up, Ive heard of people haven no problems getting mid to low 30s without any problems.
 
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