I second bigben's comments in #10 above. Especially the gasbuddy ap. It has saved us lots of cash. We normally travel around 350 miles a day, and often the gas price is much different between states, due to varying state gas taxes. I use the map feature to check within my driving range. I prefer truck stops, since we tow a car, but can usually manipulate my way in and out of most stations, if I can think quickly enough.
I can drive 1000 miles if necessary, but DW thinks 7 or 8 hours is enough, and we don't normally hurry around in the morning. We figure we average about 50 mph, including stops for fuel and food.
With my last Class A V-10, I would do likewise, kick the cruise off before even the smallest hill, like an overpass. You'll get a feel for the shift points before long. I don't mind if we lose some speed before the crest. A screaming engine may not do any damage, but it has to have a negative impact on mpg! Of course, up a long 6% grade, conversation will have to wait until you clear the top.
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