RPMs/MPH - Maximizing Fuel Economy
I'm curious if there is a "sweet spot" that yields maximum fuel economy relative to engine RPMs and coach speed (MPH). I have a 2016 Dutch Star 4018 which has the Cummins 450 HP engine. I called Cummins today to get their input and was advised this engine reaches maximum torque between 1400-1500 RPMs and maximum HP between 1800 to 2100 RPMs. But because he did not have the transmission specs he was unable to determine the most efficient RPM/MPH combination that yields the best fuel economy. I assume how the coach is loaded in terms of weight has an affect but I'm interested in hearing from others who have learned or have determined the best RPM and/or MPH combination that yielded the best fuel economy for their respective coach. Would appreciate hearing from others that are a lot smarter than me in knowing how these wonderful machines run and at what RPM/MPH combination I should be shooting for. I truly enjoy the ride and the view through that huge windshield and I'm in no hurry to get down the road, just would like to be traveling economically.
Allen & Angel
2019 Dutch Star 4369, 2016 Dutch Star 4018 (Sold)
2015 Jeep Wrangler, Blue Ox, Air Force One