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qumqats
Depends on the gearing of the car.
It doesn't work too well on my car.
It's an automatic.
First is so low that I'm going 10 to 15mph, second is too high and i go zipping down the grade riding the brakes.
I make sure there's no one behind me as I approach the grade turnoff, otherwise I end up having to pull over to let them pass while I'm on OPG. I use 2nd for the straights, brake HARD to get down to 10mpg and downshift into 1st for the corners.
I have a great deal of respect for downhill OPG. I just about totaled a car in a wreck on it.
respect the road
and REALLY respect the wet road!
Once I discovered it, I've always used OPG up and down. I did have quite a scare once about 5 or 6 years back, however. I currently live in NJ so my trips to Yosemite always involve a rental car. On this particular trip, we got some model of Korean car by a company that only sold cars here for a brief time. Whether it was a transmission problem or just a completely non-intuitive design, I discovered as I was coming down OPG that I couldn't shift in to a lower gear. I ended up riding the brakes as lightly as I dared all the way down. I was shitting bricks for the whole two miles but was trying to play it cool so as not to panic my wife who was busy soaking up the view with only occasional comments about "aren't you going a little fast?" As we were approaching the stop sign at the bottom of the hill, she asked "what's that awful smell?" It was, of course, the brake fluid boiling away like mad.
It took me practically standing on the brake pedal in conjunction with using the parking brake (which, IIRC, was one of the foot-pedal ones on this car) to come to a halt with out tearing in to the traffic coming off the bottom of NPG.
I pulled in to the first turnout on 120 to let the car rest and only then did I tell her what had happened. Needless to say, shifting in to low gear is now one of those things I try out before I even leave the airport garage.
I still love this road, though...partly for it's historical connection as part of the original Big Oak Flat Road, partly because of the huge savings in time (it's not just much shorter, you won't find any terrified "I never knew there'd be roads like this when I rented my first double-wide RV" people in front of you) and partly because it's just fun to drive!
--David