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That's pretty much what I do in the family vehicle - Honda Odyssey automatic. Gain some speed to I can lose it on the climb while still staying in top gear.
I tested my hill in my manual car again this morning, taking the low-rpm concept to its absurd limit. I started at 18 mph in 5th gear (800 rpm). I was (barely) able to gain speed at first, but started gaining more farther up as rpm increased. I topped out at 40 mph instead of 45. Result: only lost 2 mpg, compared to 3 mpg yesterday starting at 25 mph.
Conclusion: with a manual, lowest rpm is best, down to where you can only maintain speed. (currently at 2500@60mph)
Now, where can I get a transmission to cruise at 1000 rpm on the highway?
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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