use assist wisely
mjrogers,
what I usually do is to place priority on maximizing efficiency instead of maintaining constant speed. I agree, it can be impossible to keep the needle pinned at exatly 65mph.
I usually keep the car in lean-burn, at around 70mpg, getting the maximum power lean-burn will give. A slight incline will make the car slow down. So I allow that for a bit, maybe down to 60mph. Then put more pressure on the accelerator to get assist (and drop into rich burn). If the incline is slight enough, this makes the car speed up. Do that until maybe 70mph and drop back into lean. repeat.
Because it uses lean-burn much of the time, this is more efficient than to just drop into rich and go up the hill at 50mpg (as cruise control would do). But it will annoy drivers behind you!
mjrogers,
what I usually do is to place priority on maximizing efficiency instead of maintaining constant speed. I agree, it can be impossible to keep the needle pinned at exatly 65mph.
I usually keep the car in lean-burn, at around 70mpg, getting the maximum power lean-burn will give. A slight incline will make the car slow down. So I allow that for a bit, maybe down to 60mph. Then put more pressure on the accelerator to get assist (and drop into rich burn). If the incline is slight enough, this makes the car speed up. Do that until maybe 70mph and drop back into lean. repeat.
Because it uses lean-burn much of the time, this is more efficient than to just drop into rich and go up the hill at 50mpg (as cruise control would do). But it will annoy drivers behind you!