HO/6spd
11-24-2002, 10:08 AM
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HO/6spd
Am buying an '02 HO 2500 4x4 short wb and can't get a straight answer what Cummins did to make the HO and what it does to the MPG loaded and empty.Thanks for the help!
11-24-2002, 10:18 AM
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Re:HO/6spd
<br>I have a 02 HO...<br><br>I can't tell you about towing mileage, but I just rolled over to 5000 miles and the last tank I got was 18.4, and that was a city/Hwy mix. I'm hopefull of 20 mpg once it's broken in.<br><br>Here's a link to the Cummins web-site that shows the differences the HO engine has over the regular one.<br><br>http://www.cummins.com/na/pages/en/p...F080C4A8F00000<br><br>Hope this helps!<br><br>Dan<br>
11-24-2002, 10:24 AM
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Re:HO/6spd
<br>Beavercreek,<br><br>I just checked this link and it's getting you close, but no cigar...<br>Click on the link, then click on the middle there where it says return to questions. Then click on question #26 (at the very bottom), there you will find your answers.<br><br>I've had the regular engine in a 01.5 auto and I much prefer the HO.... I think you will enjoy yours.<br><br>Dan
11-24-2002, 05:12 PM
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Re:HO/6spd
I have put 10,000 miles on mine since I took it off the dealer's lot to go deer hunting in August 2002. It is moving into the 19s in highway driving and around 17 around town. The surprising thing is it gets between 15 and 17 offroad in 4 high 
11-25-2002, 05:36 AM
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Re:HO/6spd
My '01 HO averages almost 21.5 overall. That's a 160 mile trip to Savannah and back every week with a 10 mile trek into the city every day while I'm there. The truck started off getting 19 and steadily increased to my current mileage at about 15K miles.
11-25-2002, 01:00 PM
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Re:HO/6spd
I have the HO and 4.10 rearend. I am only seeing 16 to 16.5 MPG. This has been checked with city only and highway only driving. Nothing seems to change it. I guess that is OK since I can drive as hard as I want and still get 16. I was expecting more though.<br><br>Right now I am at around 6500 miles. I pulled a triple axle construction trailer with my Dad's powerstroke on it for a while to try and break it in. During this trip (250 miles) I got 12.3 MPG. That trip did nothing to help the mileage.
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11-26-2002, 09:19 AM
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Re:HO/6spd
couple of points: first, mileage can continue to improve until about 50,000 miles depending on how you break it in. If you tow a lot and make it work hard all the time, the wear-in curve is much shorter at about 10,000 miles or perhaps 15,000. 250 miles of towing will not break anything in ;D. If you drive empty it can take up to 50,000 miles. That said, I'm hearing from most guys that they see no more than 1-2 mpg improvment over this time period. Also, every truck and every driver is different.<br><br>Second, you can expect a significant reduction in fuel economy at high RPMs (above 2000-2200). As Smokey suggested, your 4.10s are probably to blame because this represents a 16% increase in your RPMs. For example, the 02 six speeds with stock 265/75 tires (depending on tire style and air pressure) run at about 2200 at 75 mph with 3.54 gears. your 4.10s will push you up to 2500 at that speed and out of the engine's efficiency band. The cummins likes to run at about 1900.<br><br>So 16.5 mpg does not surprise me with 4.10s. I get 18.5 at 65mph but when I drive 80 I get only 17. I have 3.54 gears on my '02 HO short box with 10,000 miles on it.
11-27-2002, 01:34 AM
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Re:HO/6spd
In my mind, fuel economy depends more on how and how fast you drive, how the truck is loaded, the weather conditions, the terrain you drive in, which rear end ratio and transmission, and level of bombs. <br><br>Dittos, also, to everything Doug said.
11-27-2002, 10:28 AM
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Re:HO/6spd
I know I have a 12v but I saw an increase in mpg when I hit close to 100k. it went from 19mpg to 20 or 21. I drove a lot over the highway so I have calculated it many times. now I am out of the college I was going to. I usally get 18 around town. That is unless I get a lead foot and try to smoke out the whole town. 