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MPG Report

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Topped it off today and I thought it would only be 10mpg based on how I was driving. There were several long steep hills lasting maybe 1/2-3/4 of a mile and I would hold it at 65-70. I went that fast the entire way there and back. The A/C was also on full blast for the duration of the trip. That should have yielded me about 21-22mpg unloaded.

This tank was with the trailer on it the whole time, did a lot of miles around jefferson city to go shopping (sisters bday). Ended up being right at 500.6 miles at the gas station and 29.013 gallons means 17.25 mpg. Sooo I'm very amazed. The trailer only weighs about 4000 but the billboard effect really loads it down. I had a quart of 2 stroke in that tank.

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Your going to think I'm nuts...

My edge Comp never leaves 5x5... I drive by EGT's and keep the MPG's up... So if my weight of load is heavy I'm not driving fast by no means... 55 MPH typically loaded is my max speed. That will put my EGT's around 800-900*F...

  • Owner

I run all day long at 1,100*F and not even sweat it... 1,200*F is my breaking point... I tend to back out of that. As for short term stabs I've been clean up to 1,400*F but under 15-20 seconds... And hauling heavy still on 5x5... :stuned: Idaho isn't for the weak and light hearted... Go big or go home! post-2-138698171438_thumb.jpg

I run all day long at 1,100*F and not even sweat it... 1,200*F is my breaking point... I tend to back out of that. As for short term stabs I've been clean up to 1,400*F but under 15-20 seconds... And hauling heavy still on 5x5... :stuned: Idaho isn't for the weak and light hearted... Go big or go home!

Yeah I was running 1100-1150 comming into flagstaff (7000ft) for like 90 minutes - was getting me a bit nervous. So many small hills up running in that low gear (OD).

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Wholly shmolly !!! .......................... I don't know if my truck would make that towing - serious .........................eeek :stuned: I think I did like a 10% grade and I had to drop to 40MPH and keep my boost at like 28 in order to keep my EGTS at 950-1000. She was working then.
  • Author

I think your pretty close to the rest of us. Your problem is the HY35 chokes out a little lower and also restricts exhaust.I just took the same trailer at the beginning of this thread to a 15% grade hill about 15 miles from here and I am doing about 1350-1400 to hold 70 up it in 5th. Downshifting is the best thing to do and slow down on any big hills.

  • Owner

I think your pretty close to the rest of us. Your problem is the HY35 chokes out a little lower and also restricts exhaust.

I think ISX has a point... Automatics with a Hy35 turbo has a 9cm2 exhaust housing and then the maunal trans truck have a HX35 with a 12cm2 exhaust housing so you could gain alittle from upgrading to a HX35 turbo.

I think ISX has a point... Automatics with a Hy35 turbo has a 9cm2 exhaust housing and then the maunal trans truck have a HX35 with a 12cm2 exhaust housing so you could gain alittle from upgrading to a HX35 turbo.

I've been thinking about that seriously ....... except say I can pick up a HX35 good used for $200. Might drop 50 EGT ?? *guessing* or spend $800 for a good used larger turbo (s300) and drop 100 EGT *guessing* or spend $300 for a methanol/injection - and get 150 drop EGT *guessing* catch my drift ?? The turbo would be nice for other reasons - but on a cost basis :shrug:

i think that the cam grind is different on 12v verses 24v. i read an article about someone who found a grind that gave 24v and HPCR more power AND better fuel economy, but probably would not meet emission testing.(no problem here in the great state of oklahoma)

  • Author

This tank is even more interesting based on how I drove. 288 Miles75 miles-76mph75 miles-70mph50 miles-Trailer going up all the hills and everything around here 70mph 88 miles-unloaded 60mph14.4 GallonsMeans exactly 20mpg :lol: Don't ask me how it does it :lmao:

  • 2 weeks later...

I get around 14 driving around and get 11-12 towing anything. I have 4.10s and im a throttle jocky i guess. I dont drive it much and when i do i like to have fun with the compound turbos.

i have seen 75-80 with the water meth on. otherwise around 70-72 psi

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Welcome To Mopar1973Man.Com LLC

We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.