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I managed to set the cruise at 60 mpg today on my way to work. It fluctuated between 57-61 mpg and maintained 57 mph pretty well. Top speed was 66 mph & slowest speed was 47 mph. I had to over ride the cruise more often, but my trip mpg was 56.26 mpg. I had a 10-15 mph head wind.
The cruise definitely takes RPM into consideration. Once I was off the highway, I got up to 30 mph & hit resume & it locked into 60 mpg at 30 mph.
The instruction booklet claims the cruise must have VSS hooked up in order to operate. I might try leaving it unhooked and see what happens. If it operates with just the RPM wire, I might be able to switch from MPG sensative cruise to RPM/speed cruise on the fly by putting the VSS wire on a switch. I will keep testing.
I set the cruise at 60 mpg on my way home and averaged 56.42 mpg. I had 5-10 mph tail wind. I didn't have to over ride the cruise as much with the tail wind and also, there is not as much traffic at night on my way home. I filled up before I left and drove 479.9 miles on 8.754 gallons for a tank average of 54.8 mpg. Top speed was 72 mph & average moving speed was 44 mph. That is up 1.32 mpg from my last tank. I was pretty surprised by this because I drove over 40 miles just testing the cruise control, all urban/city driving with idling, stopping & restarting.
Another interesting observation I made is since you can resume your previous MPG, once I get into town I can hit resume and keep my instant MPG higher than my current trip, so my MPG continues to climb until I get home. Of course, this is assuming I don't experience many stop lights.
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