Per manual the L button can be used at any speed. I will use mine sometimes to slow down from 70 to enter city speed reduction zone or to make a turn. (Don't have to mess with max regen without getting hydraulic assist if done manually). Depending on how you drive normal mode can get better mpg than eco or even slippery. Each one has its own best balance for conditions. I have an overall downhill 0.8 mile approach before I get home that at 35 after a 90° turn I drop into N then shortly before low water crossing dip at about 48-/50 drop into Drive, push L button till about 22 then accelerate to 35+/- without L button to coast to stop sign.I'll switch to Eco mode to brake when I'm coming up to a stop at high speeds and let the eco mode slow down the vehicle before applying brakes. If I'm going lower city speeds, I'll use the L button to slow down instead of braking.
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