2016 Chevrolet Silverado HD - Speed vs FE
2016 Chevrolet Silverado HD - Speed vs FE From the graph,a 68 to 70 mph crossover occurs at ~ 19 mpg so that would more than likely be its highway rating if it were rated. RPM@60 mph = 1,480 RPM Speedometer at 60 mph actual (Garmin) = 61 mph. CC was at 60 as well. At 70 mph actual (Garmin), the CC and Speedo are both set and read 71 mph.