Join Date: Dec 2016
Location: Vancouver, BC Canada
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The best technique is to try to maintain your speed ("coasting", as Cardyin said). Every time you slow down, even if you're using regen to do it, you loose some energy. Regen helps to recover some of that energy, but it's not 100% efficient so you won't recoup as much as you lost slowing down.
If you find it easier to coast (i.e., avoid using any power or any regen) in "D" mode then that's the better mode for you. If you find it easier in "L" mode, than go for it.
You can also use the cruise control, but if you're not driving on a perfectly flat road it may be better to control the throttle manually. In gently rolling hills cruise control will waste energy trying to slow you down on the downhill portions, whereas good manual driving technique can use the gravity assist on those downhill portions to build up some momentum to carry you over the uphill portions.