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Prime EV Mode Questions

7.4K views 8 replies 7 participants last post by  cometguy  
#1 ·
Per Toyota.com
2.5-Liter Dynamic Force 4-Cylinder engine with Sport, ECO, Normal, EV, HV, Auto EV/HV, Charge, Trail drive modes; 302 combined net hp; 177 hp @ 6000 rpm; 165
lb.-ft. @ 3600 rpm
Electric motor: power output (front/rear) 179/53hp (134/40kW); torque (front/rear)
199/89 lb-ft
Battery 355.2V

  • Does this mean, without firing up the ICE, the vehicle can put down 232 HP?
  • Is there a maximum speed, at which the ICE has to fire up like traditional hybrids?
  • Is there a high/low temp cut off, at which the ICE has to fire up to provide for the HVAC?
  • Is the net 302 HP, only available with a fully charged battery pack?
Still waiting in Texas. $500 deposit put down in Feb. First one in line at a dealership.
 
#9 · (Edited)
I had a chance today on a longer road trip (200+ miles), mostly via interstate highways at 70-80 mph, to test the EV/HV modes in our 2021 RAV4 Prime SE. I do not understand why Toyota put two large buttons on the lower central control panel there by the gear shifter, when one (perhaps with a dial) would have been better; indeed, my Porsche E-Hybrid puts a dial on the steering wheel for quickly changing between the modes, which is super-convenient. Anyway, here's what I learned: The left button toggles between EV-only mode and "HV auto", the latter of which seems to keep you mostly in EV mode until the battery gets close to depletion (which makes little sense to me). The right button toggles between EV-only mode and "EV/HV", the latter of which seems to drive with the engine on most of the time (at least at highway speeds). So when I pushed the left button to get "HV Auto", the battery depleted very quickly; when I pushed the right button to get "EV/HV", the battery level seemed to stay pretty much the same (i.e., it served as a "Hold the charge" button) -- meaning that it would allow the battery to work with the engine periodically to power the wheels, but rarely the battery alone would run the wheels without the engine involved (and then mainly when coasting/braking), and often the engine would both power the wheels and charge the battery pack. I did not bother to again push and hold the right button, which causes the engine to stay on while charging the battery pack, as it was sufficient for me to just keep the same level of charge in the battery pack.

I started out from home on my trip today with a full charge (the computer said "44 miles"), and when I got to my destination it read about 37 miles, then did some all-electric local driving before heading home with "30 miles" reading for the battery pack. Over the final 10 miles to home, I changed to all-EV mode and entered my garage for the night with "4 miles" reading for the battery. A couple miles prior to getting home, I filled up my RAV4 Prime SE for the first time since bringing it home new from the dealership brand new exactly 3 weeks ago (with a full gas tank and full battery charge then), and it took 9.6 gallons with the gas gauge reading about 1/4 full (so no obvious problem with the gas gauge) -- which translates to about 85 mpg over the first 3 weeks of ownership and 840 miles on the odometer. Not bad. (And we aren't babying or "hyper-miling" our Prime in the slightest; we mostly drive locally but don't hesitate to accelerate quickly and drive fast -- which is part of the fun of the Prime!)

I have gotten our RAV4 Prime up to 80 mph in all-electric mode without triggering the ICE, which is plenty fine. My Porsche PHEV goes to 86 mph before the ICE kicks in automatically, so the Prime is in good company with my Porsche.