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I've tried to climb a mountain in a 90' Civic DX and I had to drop to 3rd and floor it to get up. I believe it was in PA on the toll road to OH.
I assume you have either a downgrade on the other side or you gotta come back down the mountain. This should cancel it out if you can coast down with your automatic.
I climb a 5 mile grade 2 times every day on my route on I64 in VA. Luckily it is another 5 miles back down on the other side. I've done a bunch of testing and really cant hypermile it. The only thing I have going for me is coasting back down. I dont EOC because of the curves on the mountain.
Here is my data:
Torque app claims I do:
0.30gal used in 10 miles on flat @65mph
0.28gal used up 5 mile grade at 65mph
0.24gal used up 5 mile grade at 55mph
0.016gal used down 5 mile grade clutch in
Below 55mph I'd have to downshift.
Either way I get slightly better FE because of the 5 mile coast. (Before discovering this site I used to run the whole 10 miles with cruise still on. LOL!)
Today I may test 4th gear and follow a truck as not to impede traffic as the speed limit is 65.
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