I can’t drive 55

Yermo/Barstow KOA

We traveled today on our way to a rally at San Antonio Lake near Paso Robles California and I thought I would travel at 55 MPH to see what the mileage results would be. I haven’t checked my mileage yet but what I did observe is that my 2002 workhorse W22 chassis with Allison Transmission does not like running at 55 MPH. The transmission normally upshifts to overdrive at 55 so it stands to reason that you can lug the engine very easy on an incline at 55. The transmission wants to downshift into 4th on any moderate incline so it appears to be shifting more often. At 63 MPH where I usually travel, the engine and transmission love it. I am going to continue to drive 55 until the next fill up. At that point I will calculate my mileage. If the results are not significant I am going to continue driving in my 63 MPH comfort zone.