Today I review a 2021 RAM 2500 Cummins and test the real world fuel economy of this Diesel Engine. I compare the 6.7 Cummins fuel mileage to a 6.4 hemi fuel economy and show you guys the major difference between the Cummins engine option and the 6,4 hemi gas engine in terms of fuel efficiency. Finally, I explain why diesel engines are naturally much more fuel efficient then gas engine.
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I hope everyone is having a wonderful week! I am with my good friend once again and his beautiful 2021 RAM 2500 with the 6.7 Cummins. Seeing the price of fuel these days I thought it would be an awesome time to first review what a truck with the Cummins is getting in terms of fuel economy vs my 2022 ram 2500 power wagon with the 6.4 hemi. Diesels naturally are much more efficient and as you guys saw the Cummins got way better fuel economy on the same test route.
so first off. my 2022 power wagon has a couple disadvantages that has nothing to do with fuel type. the truck sits on more aggressive tires which is not going to help fuel economy. the power wagon also sits 2 inches higher meaning the aerodynamics are not going to be as good resulting in more fuel consumption. finally, the gearing in my truck is 4.10 vs 3.73 resulting in once again my truck drinking more fuel.
Now the cummins does have one disadvantage which is the weight. the weight of the cummins is equal to about an extra 1,000 pounds so the 2021 ram 2500 will weigh more then the power wagon.
now the reason the cummins and any diesel has so much better fuel mileage then a gas burning engine is a couple of things. first a gallon of diesel has about 10-15% more energy in it then a gallon of gas. so that right there is a pretty simple reason.
another reason is because of the thermal efficiency of the diesel engine. gas and diesel are both heat engines. meaning they translate heat energy in mechanical energy and the diesel does this at about 40% better then a gas engine. the reason is manly to do with the high compression ratio of a diesel engine.
a diesel engine is also unthrottled meaning you can throw as much air into as you want. whereas a gas engine throttles both air and fuel making is not as efficient at certain rpm ranges.
so those are the major reason a diesel is much more fuel efficient then a gas engine.
the last thing I'll mention is that the aftertreatment system on these truck also eat up some fuel economy. on average without an aftertreatment system a diesel engine is about 20% more efficient. so just keep that in mind.
anyways guys I hope you like the video!
