RaptorHD
Senior Member
- Joined
- Aug 13, 2020
- Posts
- 185
- Reaction score
- 170
- Location
- South Carolina
- Ram Year
- 2019 2500HD
- Engine
- 6.7 Cummins
Well,
If anyone claims a gasser has better fuel efficiency than a diesel just has no "real" clue... A diesel burns fuel far more efficiently than a gas engine.. Second as another poster explained, it has alot to do with what terrain your driving, the transmission, the axle gears, fuel quality, what speed and lastly what your hauling (weight) A diesel will pull and hit a plateau with wieght, in other words, load a dually with 15klbs and it will get XX for mileage, load it with 20k and the mileage will be very close. Diesels love to work HARD! gas engines do not..
My 2001 Ram 2500 5.9 got 27 Hwy, it had a 6 speed manual.. My 2008 got 24Hwy with the 68RFE, my 2019 5th Gen is no different it gets 24-25 Hwy depending.. Now what was the big difference in mileage? EPA,,, let me say it again--EPA!
The 5.9 was noisy as were the generations earlier, the emissions were not that bad--if you kept them they made the 6.7, good motor but started injecting fuel prior to the combustion process to reduce noise (waste fuel) then there is the regen process--more wasting fuel...Earlier Gen trucks we could --displace-- the emissions "ehem" and see better fuel economy. Now its not that simple.
What we can do, is look at our drivetrain, your engine has an rpm where it will get the best fuel economy and its between 1300-1500 rpm's. If your driving down the road at 80mph @ 3200 rpm, don't be "That guy" and complain your not getting good fuel economy,
Don't get me started on the Morons out there rocketing down the road with an 18000lbs trailer at 85mph. If you are that guy, yes I will call you a MORON! 1. The trailers are not made to run down the road above 65mph, most states have a law that trailers are to drive @ 55mph, actually I think that is a federal DOT law, whether or not its enforced is another story.
2. You endanger everyone else on the road
3. Every force that affects your trailer and truck is multiplied above 55 like sway etc.
I pull heavy trailers (Gooseneck) and I pull them @ 55mph and I see great mileage! When I drive the highway with no trailer I usually cruise at 65mph and I don't do it in the fast lane
I will close with this-- Freight trains use a diesel engine to run the generators that power the DC motors, they require insane torque to get it moving, those semi trucks on the road getting that I-phone and starbucks coffee to the snowflakes uses a diesel engine too--why? Because if a gas engine was as good as people say it is pulling weight (and its not) all those would have gas engines!
Any diesel mechanic knows this, steering wheel holders do not!
If anyone claims a gasser has better fuel efficiency than a diesel just has no "real" clue... A diesel burns fuel far more efficiently than a gas engine.. Second as another poster explained, it has alot to do with what terrain your driving, the transmission, the axle gears, fuel quality, what speed and lastly what your hauling (weight) A diesel will pull and hit a plateau with wieght, in other words, load a dually with 15klbs and it will get XX for mileage, load it with 20k and the mileage will be very close. Diesels love to work HARD! gas engines do not..
My 2001 Ram 2500 5.9 got 27 Hwy, it had a 6 speed manual.. My 2008 got 24Hwy with the 68RFE, my 2019 5th Gen is no different it gets 24-25 Hwy depending.. Now what was the big difference in mileage? EPA,,, let me say it again--EPA!
The 5.9 was noisy as were the generations earlier, the emissions were not that bad--if you kept them they made the 6.7, good motor but started injecting fuel prior to the combustion process to reduce noise (waste fuel) then there is the regen process--more wasting fuel...Earlier Gen trucks we could --displace-- the emissions "ehem" and see better fuel economy. Now its not that simple.
What we can do, is look at our drivetrain, your engine has an rpm where it will get the best fuel economy and its between 1300-1500 rpm's. If your driving down the road at 80mph @ 3200 rpm, don't be "That guy" and complain your not getting good fuel economy,
Don't get me started on the Morons out there rocketing down the road with an 18000lbs trailer at 85mph. If you are that guy, yes I will call you a MORON! 1. The trailers are not made to run down the road above 65mph, most states have a law that trailers are to drive @ 55mph, actually I think that is a federal DOT law, whether or not its enforced is another story.
2. You endanger everyone else on the road
3. Every force that affects your trailer and truck is multiplied above 55 like sway etc.
I pull heavy trailers (Gooseneck) and I pull them @ 55mph and I see great mileage! When I drive the highway with no trailer I usually cruise at 65mph and I don't do it in the fast lane
I will close with this-- Freight trains use a diesel engine to run the generators that power the DC motors, they require insane torque to get it moving, those semi trucks on the road getting that I-phone and starbucks coffee to the snowflakes uses a diesel engine too--why? Because if a gas engine was as good as people say it is pulling weight (and its not) all those would have gas engines!
Any diesel mechanic knows this, steering wheel holders do not!