Uphill or downhill?

Neither. Let the speed slip on the uphill side, and let gravity accelerate you on the downhill.

Tom

 

Good Advise. I generally drive my G3, IV normally. I stay with the flow going up, not accelerating, at the crest of the hill I may regain any speed that was "bled" off going up, but if it is a long downhill, I find the "sweet spot" and let her coast. If the speed picks up too much, I retard it with the "B" setting, otherwise, I let her run free. As long as you are not driving 75-80 mph, I find I can achieve about 53 mpg on the Interstate, even in the mountains (where we live).

Good Luck

 

I would say if possible pick up a little excess speed prior to the hill, then let the speed decay as you climb it, the objective being to stay out of the power portion of the HSI. I would coast as much as possible on the downhill, use regen braking if necessary, but stay out of B if possible, B's function is to waste energy and I would want to recover, not waste if possible. Be cautious of safety of course, use B if needed for safety.