cummins 4bt mileage in an m715

[LAlessi]

ok heres what i have so far.

the truck is not its most fuel effecient on the highway. theoretically it should do 85 on the interstate at 2500rpm. if i floor it i can get 73, but not exact on rpm... . maybe 2000-2200, i dont have a tach but i know its not fuel effecient doing that. i dont know if its parasitic loss or what. but for the below numbers i dont care too much right now





results

145 miles =60 miles highway (65 to 70)/85 town

24. 16 mpg!!!!!!!!!!!!!!!!!!!!!!

250 miles =220 miles highway (65 to 70)/30 town

23. 7 mpg!!!!!!!!!!!!!

tomorrow im going to try and drive just town miles or less than 60 to check.

 

[michigandon]

Well, it certainly doesn't sound to me like anyhting to complain about, especially considering that an M715 was never really intended for use on a Interstate highway anyhow.



I don't even wanna know what kinda MPGs the original six-banger got. :{



Don

 

[HoleshotHolset]

I thought the M715 had REALLY steep gears in it?



That's kicka-- mileage!!!



Matt

 

[JDMills]

Correct me if I am wrong but I think M715's have 5. 83:1 gears in the rear end. . but then you would be on the governer at 45 mph or so. any way that sounds like good mileage from a HD 4x4.

Jason

 

[LAlessi]

m715 stock gears is 5. 87



my truck has a 4bt, nv4500 and DIVORCED np205 with a dana 60 front and 14 bolt rear and 4. 56 gears.

 

[HoleshotHolset]

That's still insane mileage... especially with 4. 56:1 gears and a pretty heavy truck...



Matt

 

[BJMarshall]

My Bronco was getting 17 running on the governor at 62-63 mph. I changed from 35" tires to 38's and it'll run 65 now with some rpm left. With the new tires, I got 20 mpg. It's got 4. 88's in it.

 

[LAlessi]

yeah, im on 38. 7's. i have a little less power with 4. 56, but i can accept the milage

 

[bgilbert]

5. 87's what a beast that truck must have been. LAlessi do you have any updates on your site? Whats the link again? Sure have enjoyed watching your conversion come about. Bill

 

[LAlessi]

its

www.homepage.mac.com/ltalessi



3-20-04 i put up new pics. im going to redo the entire site when i get a chance. . more text and more pics.