Performance/Efficiency versions of Cummins 6.7L
It appears that Cummins is doing the same thing to their 6.7L engines that they have been doing with the larger on highway engines for the past few years by making a performance version and an efficient version of the same engine. The performance versions of their engines have higher power levels at the expense of lower compression ratio to keep NOx levels within standards. The efficient versions generally have higher compression ratios at the expense of power. For those that do not know, compression ratio has a direct correlation with an engines efficiency and how much NOx it produces at a given power output. Essentially the more power you produce, the more NOx you create so to combat this you have to lower compression ratio which reduces efficiency.
With the 2019 Cummins, the 400 hp "performance" version with the Aisin comes with a 16.2:1 compression ratio(down from 17.3:1 from 2007-2018) while the 370 hp "efficient" version with the 68RFE comes with a 19.0:1 compression ratio. However, it appears Ram is not calling them performance or efficient version like Cummins does with their other engines.
There are no official reviews on the fuel mileage difference, but I would wager it is around a 1-2 mpg(could be more) difference between the two which is similar to the difference percentage wise in the larger engines. Maybe Ram/Cummins is finally listening to many people here who have stated that these trucks make plenty of power for what the average consumer tows, and to start focusing on making the engine more efficient instead of increasing power/towing ratings at the expense of efficiency.
What do you think? If you had a choice and towed less than 20k lbs, would you choose the 400 hp/1,000 lb-ft performance version at the expense of 1-2 mpg or go with the 370 hp/850 lb-ft at the expense of 30 hp and 150 lb-ft and higher than 20k tow rating?
With the 2019 Cummins, the 400 hp "performance" version with the Aisin comes with a 16.2:1 compression ratio(down from 17.3:1 from 2007-2018) while the 370 hp "efficient" version with the 68RFE comes with a 19.0:1 compression ratio. However, it appears Ram is not calling them performance or efficient version like Cummins does with their other engines.
There are no official reviews on the fuel mileage difference, but I would wager it is around a 1-2 mpg(could be more) difference between the two which is similar to the difference percentage wise in the larger engines. Maybe Ram/Cummins is finally listening to many people here who have stated that these trucks make plenty of power for what the average consumer tows, and to start focusing on making the engine more efficient instead of increasing power/towing ratings at the expense of efficiency.
What do you think? If you had a choice and towed less than 20k lbs, would you choose the 400 hp/1,000 lb-ft performance version at the expense of 1-2 mpg or go with the 370 hp/850 lb-ft at the expense of 30 hp and 150 lb-ft and higher than 20k tow rating?
