Showme 5vr
Belton, USA
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Just discovered that the new RAM we ordered has been built and is waiting to ship. The 2015 RAM 2500 with the regular 6.7L Cummins that we have now will get around 20-21 miles per gallon when running empty on a trip. Does anyone have experience with the HO on fuel mileage? Both trucks have the 3.73 rear end.
Thanks
Steve & Judy 2023 RAM 3500 6.7L Cummins HO Crew Cab LWB, 2017 Grand Design Reflections 337RLS
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cummins2014
Utah
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Showme 5vr wrote:Just discovered that the new RAM we ordered has been built and is waiting to ship. The 2015 RAM 2500 with the regular 6.7L Cummins that we have now will get around 20-21 miles per gallon when running empty on a trip. Does anyone have experience with the HO on fuel mileage? Both trucks have the 3.73 rear end.
Thanks
Pretty sure your 2015 SRW has the 3.42 rear end ,unless you put 3.73's in it . As far as mileage no idea , but would stand to reason having 3.73 in the new one ,probably slightly less mileage would be my guess .
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4x4ord
Alberta
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cummins2014 wrote:Showme 5vr wrote:Just discovered that the new RAM we ordered has been built and is waiting to ship. The 2015 RAM 2500 with the regular 6.7L Cummins that we have now will get around 20-21 miles per gallon when running empty on a trip. Does anyone have experience with the HO on fuel mileage? Both trucks have the 3.73 rear end.
Thanks
Pretty sure your 2015 SRW has the 3.42 rear end ,unless you put 3.73's in it . As far as mileage no idea , but would stand to reason having 3.73 in the new one ,probably slightly less mileage would be my guess .
The High Output also has a lower compression ratio which is also likely to contribute to poorer fuel economy when empty. On the other hand, I would guess that neither the gear ratio nor the lower compression ratio will have much affect on the truck's towing mileage.
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Groover
Pulaski, TN
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4x4ord wrote:cummins2014 wrote:Showme 5vr wrote:Just discovered that the new RAM we ordered has been built and is waiting to ship. The 2015 RAM 2500 with the regular 6.7L Cummins that we have now will get around 20-21 miles per gallon when running empty on a trip. Does anyone have experience with the HO on fuel mileage? Both trucks have the 3.73 rear end.
Thanks
Pretty sure your 2015 SRW has the 3.42 rear end ,unless you put 3.73's in it . As far as mileage no idea , but would stand to reason having 3.73 in the new one ,probably slightly less mileage would be my guess .
The High Output also has a lower compression ratio which is also likely to contribute to poorer fuel economy when empty. On the other hand, I would guess that neither the gear ratio nor the lower compression ratio will have much affect on the truck's towing mileage.
That is less than a 10% gear ratio change so it shouldn't have a big effect. You don't generally see a large drop on diesel fuel economy until you start getting out of their torque range. The drop in torque is largely due to less efficient combustion.
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2oldman
NM
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quote festival
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ssthrd
Vancouver Island
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2oldman wrote:quote festival
Indeed. ![[emoticon]](https://forums.goodsamclub.com/sharedcontent/cfb/images/smile.gif "smile")
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Cummins12V98
on the road
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More info on the new truck??? 3500? AISIN?
Have to say this is a question to have been asked if it really matters BEFORE buying the new truck.
2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
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4x4ord
Alberta
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^^^ I think it’s got to be a 3500 series with the Aisin …. the high output is only available in a 3500 series and is only available with the Aisin.
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Cummins12V98
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4x4ord wrote:^^^ I think it’s got to be a 3500 series with the Aisin …. the high output is only available in a 3500 series and is only available with the Aisin.
I am sure it is also, OP should have said specifically what the tuck is for those who don't know all the backstage info.
His 15 has 3.42's unless changed as mentioned.
Highly unlikely he will get that good of mileage with the new ride.
I guess the topic did have some info "RAM 3500 with HO 6.7L Cummins SRW"
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cummins2014
Utah
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4x4ord wrote:^^^ I think it’s got to be a 3500 series with the Aisin …. the high output is only available in a 3500 series and is only available with the Aisin.
I was going to say ,it would be the Aisin if it's the HO . Like 12V said , that's a question to be asked before purchase if concerned . Never gave mileage much thought , truck was not bought for economy . Mileage towing as said is probably going to be about the same.
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