Question about gearing

[texasfireman]

I have an 01 2wd 5sp 2500. It runs just on the top side of the 2000rpm mark @ 70 mph. It will only get 18mpg. I think its a 3:73 but Im not sure. Everyone on here seems to get 20+ mpg, Im running 2 cycle and still 18 is it. Any ideas on why it wont get 20+?

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01 cummins quad cab short bed 2wd 5sp. Edge comp, Edge Jammer 75 horse Injectors, BHAF, MBRP 4in turbo back,to a 5 1/2 in single stack, Silencer Ring? What Silencer Ring? And a Smoke Switch for fun.

[SoTexSmokin]

My 99 was exactly the same way, also the same setup as you. Im not real sure why some are like that, I remember my buddys truck identical to mine would get 21 22 all day long.

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08 Mega DRW, 68RFE, Brilliant Black, Laramie, HARD LOADED!, Leveling Kit, 35 12.50 Cooper STT's, KMC Rockstars, B&W Turn-over ball, Tough Country, Limo Tint, Custom Stereo, H&S Turbo Back DPF Delete, K2 EGR Block, Edge Juice With Attitude, S&B MP8 SOON!

[white_rider]

Originally Posted by texasfireman

I have an 01 2wd 5sp 2500. It runs just on the top side of the 2000rpm mark @ 70 mph. It will only get 18mpg. I think its a 3:73 but Im not sure. Everyone on here seems to get 20+ mpg, Im running 2 cycle and still 18 is it. Any ideas on why it wont get 20+?

you prob got 3.73 but they might have 3.55 thats what my dad has i have 4.10...yea its good 4 pullin but im gettin bout 11-13mpg takin it ez

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"Justin" storm troopin' 98.5 dodge 3500, cummins turbo diesel with tb straight, edge comp box, full replacement guard, smoked cab lights, custom audio, cb radio on channel 19, and a 4.10 axle ratio

[MCummings]

Slow to 65, run without the a/c, keep the windows up, max air pressure in the tires, oh, and you have 3.55's. '73's weren't an option in 2nd gens and you'll get better mileage.

Be sure to run a electronic performance booster like a XZT, or a Mileage max, put a good muffler (magnaflow is my fav) and step up to a 2.2 injector or so from page1 Those mods should get you atleast 2MPG.

Also, don't run too heavy on the 2-stroke oil. Keep it up around a 164:1 ratio.

Keep an eye on your fuel pressure and run the lightest oils you can in all the drivetrain. I've seen HP gains on the dyno using royal purple.

Oversize tires, grill guards, and an all stock motor will take away mileage.

Merrick

EDIT: I see your sig shows a MBRP, Edge, and a BHAF. Those are all pretty good. I saw a bigger performance gain running a K&N re-0880 air filter.

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'98.5 3500 2wd 6-speed
512/1021, 21MPG and 65 pounds of boost.
Hers,
'98.0 2500 4wd Auto, Lifted, Straight pipe, no plate, no afc, 38" Boggers, Viper alarm. 108K miles.

[fordkiller43]

Originally Posted by MCummings

Slow to 65, run without the a/c, keep the windows up, max air pressure in the tires, oh, and you have 3.55's. '73's weren't an option in 2nd gens and you'll get better mileage.

Be sure to run a electronic performance booster like a XZT, or a Mileage max, put a good muffler (magnaflow is my fav) and step up to a 2.2 injector or so from page1 Those mods should get you atleast 2MPG.

Also, don't run too heavy on the 2-stroke oil. Keep it up around a 164:1 ratio.

Keep an eye on your fuel pressure and run the lightest oils you can in all the drivetrain. I've seen HP gains on the dyno using royal purple.

Oversize tires, grill guards, and an all stock motor will take away mileage.

Merrick

EDIT: I see your sig shows a MBRP, Edge, and a BHAF. Those are all pretty good. I saw a bigger performance gain running a K&N re-0880 air filter.

Good write up Merrick

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'02 2500 4X4 auto; SC VB, Drag Comp, FBD 100's sticks, AFE stg II, Silencer ring MIA, J hook, Banks High Ram, Carter pusher, Triple Pillar w/ Boost, Pyro, and FP gauges, MBRP 5" str8 pipe, 4.5" skyjacker, DSS bar, 35" Bighorns, Frontier bumper... s300 66/14 on its way! Coaltrain trans in the making