Marvin Posted November 9, 2020 at 08:00 PM Report Share Posted November 9, 2020 at 08:00 PM It appears that both Low and Grade Assist do engine braking for extended downhill driving. Which is preferred? Should I ever use both? Quote Link to comment Share on other sites More sharing options...
murphy Posted November 9, 2020 at 08:41 PM Report Share Posted November 9, 2020 at 08:41 PM Neither Low (totally misnamed - it is not a gear change) nor grade assist use the engine if the HVB is not fully charged. Instead it charges the HVB. I drive exclusively in L and use grade assist when going down hill. The charge rate can be modulated with the accelerator pedal. I almost never use the engine for anything. I put about 2 gallons of gas in the car per year. It is my local driving car. Long distance driving is done with a BEV. Quote Link to comment Share on other sites More sharing options...
jsamp Posted November 10, 2020 at 05:44 AM Report Share Posted November 10, 2020 at 05:44 AM The other option you have, depending on the speed limit is to use cruise control. Interestingly, I found cruise will use whatever regen is necessary to maintain the proper speed on a long hill. This is even true if you are in "D". I used this on "the grapevine" in Southern CA. It is a freeway coming down out of the mountains with a single downhill over 6 miles long and almost 2000' elevation drop. I gained 6 miles of regen in those 6 miles of driving, while still in D with cruise set to the speed limit. jj2me 1 Quote Link to comment Share on other sites More sharing options...
murphy Posted November 10, 2020 at 11:40 AM Report Share Posted November 10, 2020 at 11:40 AM Someone, who used to be on this forum, charged his battery from empty to full coming down from the top of Pikes Peak. That is an over 14,000 foot drop in elevation. Quote Link to comment Share on other sites More sharing options...
jsamp Posted November 10, 2020 at 05:27 PM Report Share Posted November 10, 2020 at 05:27 PM Not quite. Pike's Peak is 14,100' elevation at the top. The town at the bottom is 7400' so it's just shy of 7000' elevation change. Still enough to charge to full though. Quote Link to comment Share on other sites More sharing options...
murphy Posted November 10, 2020 at 05:52 PM Report Share Posted November 10, 2020 at 05:52 PM I stand corrected. I was up there once around 1965. Quote Link to comment Share on other sites More sharing options...
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