I have driven the (US model, I’m in Seattle) 2023 PHEV only once, but have owned a 2018 PHEV since new.
The 2018 is EPA-rated at 26 mpg and this is exactly what you will get on the freeway at 60 mph if you just keep it in the default D gear and don’t use Charge mode and start out with a completely depleted lithium battery pack. That is, 26 mpg is what the gasoline engine on its own, in the MY2018 PHEV, will deliver.
I have no idea how the EPA testing rules affect other hybrids’ official mpg ratings such as the Toyota hybrids.
I do know that in real world everyday use with my PHEV in service as my fulltime Uber vehicle, taking prudent advantage of the range extension provided by the lithium battery pack, I routinely get 30 to 35 mpg on the freeway (Interstates 5, 90, and 405 at 60-70 mph). This is with the AC and heating always on (climate control set at 73-76°F depending on outside air temperature), usually with the adaptive cruise control on, and with 4WD Lock always on except when going uphill (the torque of the rear motor acts as additional damping on the rear suspension, thus giving my passengers a smoother ride) (but for some unknown reason when going uphill with 4WD Lock on the Charge mode does not work, so I shut 4WD Lock off until I crest the hill. The rear motor continues to be used anyway.). Oh, and also, that’s with Michelin Primacy Tour all-season 225/60-R18 tires which have more rolling resistance than the factory 225/55-R18 Toyo A24’s. I have found that the taller the sidewall the better the ride and the MUCH quieter the cabin. My next tires will be 235/65-R18.
Overall mileage is around 28 mpg but this poor of mileage is only because I idle a lot and stop and start a lot. Take the car out of Charge or Save mode when stopped, to cause the gasoline engine to shut off. I often forget to do this. When I consistently remember to use null mode at standstill I get 30-31 mpg combined city+freeway, calculated at the gas pump at the end of the day. Oh, and, I almost never use external charging.
There is another current thread, having to do with a burning rubber smell, in which I describe my complete driving regimen. I don’t know how applicable it would be to the 2023 PHEV because the 2023 no longer gives you a single button to drop in or out of 4WD Lock mode, instead it has a road surface selector knob which I have not had time yet to experiment with. But I would bet that I could make the 2023 PHEV give the same 20-25% more mpg as a daily average than its official EPA-rated 26 mpg (combined city+highway), just as I do with my 2018.
Last edited by 2018gt
on Sat Jan 21, 2023 6:28 pm, edited 3 times in total.