In my opinion, accelerating on an incline follows the same idea, it uses a lot of fuel no matter what you do. So what I do is still accelerate with a good bit of throttle (not wide open flooring it) but relatively high engine load. I shift a little bit higher (1600 on flat ground/ 2000 going up hills), I use the torque of the motor (BSFC - worth a search on here), and just get it done and out of the way. Trying to pull really slowly up the hill, you will have poor MPG, for a longer period of time compared to just getting on the throttle for a shorter time.
There have been a number of discussions on techniques for hills. If you have some time it is worth a read, a lot of people have given input with all different types of vehicles.
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