Prius Prime EV mode vs my 2012 Plug in.

Short answer is yes, the 2023 (and even the Gen 4 2017+) Prime has much improved EV range over the original Plug-In. I think the Gen 4's give mid-20's EV range and 2023 is up to mid-30's miles EV.

 

i don't have any trouble staying in ev, except occasionally in winter. the new ones are improved, and they have an electric heat pump for mildly cold weather. but how will you drive without the front defrost?
why hasn't the battery improved your mileage?

 

Sorry, deleted, not pertinent.

 

gotcha. driving slow trumps everything.

the gen 4 and 5 prime can go higher speeds without the engine.

 

I second third and fourth all the above. I never had any porblem keeping my 14 PiP in EV - summer and winter. But I drove it slower than normal. Even new the PiPs max EV speed was 64 mph so I'm not too surprised that you do have trouble keeping your 12 in EV mode at that speed. If it were me and I couldn't figure out any way of keeping the car in EV to my satisfaction, I'd just put it in HV and drive slow enough during the warmup cycle where you learn how long it takes to complete that cycle per the outside temps, than just drive the way you normally would and see if that helps even just a little bit.

 

Even with the Prime, in HV mode, if the outside temp is below around 60 F the engine will start up at 20 mph or higher and run through it's warmup cycle. It usually takes the Prime about a mile to finish the warmup cycle, almost 2 miles if outside temps are below around 40 F. If it's above 80 F it usually takes about .5 miles.
All these points are while driving the car at or below about 30 mph. Faster speeds take longer to complete most of the time except when it above around 80 F.

 

How many miles on her? You might have a plugged egr

 

sorry i deleted my post

 

It been a while since it's been below 60 F and thinking back to when it was below 60 F I should have said, that as soon as selecting HV and temps are below around 60 F and both battery temps and coolant temps are also below 60 F the engine starts. The temps mix can vary slightly, but I think once a driver gets used to the every 20 degree F shifts the Primes programming "starts to" make more sense.

And just because I see a difference the way I drive my Prime, doesn't always mean everyone / anyone else is going to see the same behavior with their Prime. So son't sue me if your Prime doesn't show you any difference at all when driving it in ambient Temps above 80 F and or below 60 F and 40 F.