MPG in Hybrid Mode

Yes.

 

Assuming your 110 miles actually had some EV drive using 46% of the traction battery, ~14 miles were actually run by battery power (30 miles EV range x 0.46). This makes your actual gas mileage ~65 mpg which is very doable with this car. Although I can keep full charge in the traction battery after a long HV drive on the same day, I have never used HV drive day after day with charge left in the battery as you did. With bisco's comment on PiP, this behavior may not be specific to 2019 model PRIME. Nonetheless, it will be interesting to find out what kind of mileage you will get on pure HV without any charge.

 

Actually it isn't the "EV charge" being used, it is the "battery charge available" that is being used. If the EV charge was not available then HV mode would use the HV charge available. The HV charge will charge back up during regular driving. It is this using and recharging the HV portion that increases your mpg's in HV mode. Depending on driving habits and weather, getting 70 - 80+ mpg's in HV mode is reasonable.

I did the same 36 mile one way commute using only HV for 6 months (Jan. - Jul.). EV was used for the morning commute and HV for the trip home. The average was 70.07 mpg's with a high of 81.2, using HV only. YMMV

 

I just did an experiment driving on HV for my short commute with full traction battery at start and 32.3 miles EV range on GOM. With my driving condition, the lowest the battery level went down was 97% at 7.0 mile mark, but with ICE running and regen replenishing the charge, I was back to 100% by 16.6 miles. It was down to 99% when I stopped at 18.4 miles. The GOM at that point was showing 31.4 miles. It is 2.8% loss of the range on GOM compared to only 1% loss of traction battery charge parentage. Not sure where this discrepancy is coming from, but it seems reasonable to think GOM incorporated my HV drive into estimation of the future EV range. Meaning that after 18.4 miles of HV drive, GOM is now estimating 31.7 miles EV range from 100% charge compared to 32.3 miles EV range initially estimated before the HV drive.

So, yeah, my 2017 PRIME unlike yours, does not dig into the traction battery during HV drive. Even a short trip. I will continue using HV for next few days to see if the traction battery level drops after a few days. BTW, this is without any HVAC (no heat or AC or fans) and minimal battery load from other electronics. I had the 11.6 screen off, head light off, no heated seat. Only thing I had on was BlueTooth audio to listen to my audiobook.

 

With my normal driving condition, getting 65 mpg is very easily done on my PRIME during summer. In fact it would take some effort to get lower than 60 mpg on this car. Remember this is displayed mpg. The real calculated mpg is about 5-7% lower than that value. I do not drive in city. There is no stop and go traffic to contend. My average speed today was 33mph with top speed ~50mph very briefly. If I was in hurry or had a big pickup tailgating me, the average would have dropped to lower 60mpg. Without that upper 60 to lower 70 mpg is very doable on HV only without any AC in mild temp season.

As stated above @Prius from Dad.

 

My commute back home was 74.9 mpg HV only. The road back has less downhill at the end, and I did not recoup the initial loss of battery charge. Ended at 96% battery charge and 30.7EV miles left. I will not charge tonight and will see how much EV range stays with the car tomorrow.

 

Another factor to consider is which drive mode (Power, Normal, Eco) is being used.
I used to use Eco exclusively for the first year of so. I now use Normal almost exclusively
as I evaluate EV HV modes and compare to what others find.

 

I did not drive today. After sitting on the driveway full 24 hours, it is showing exactly the same 96% battery charge level and 30.7 miles GOM EV range. No ghost battery use on my car like reported by someone in a different thread.

 

Comment I read in other thread on 2017 PRIME (quoted on my #30 comment on this thread: MPG in Hybrid Mode | Page 2 | PriusChat) was that after the battery is fully charged and driving it HV only, the battery kept losing the charge down to ~80%. The loss included some phantom use during overnight parking. Similar behavior was observed by OP's 2019 PRIME. I don't think it is model year difference but seems to be different by the operator. In my case, so far in 2 days, 4% loss all during driving HV.

 

Were you using any AC function (cool or heat or just fan) during any of those HV drives? Since some 2017 owners were reporting similar behavior, there must be something that consumes battery power even on HV. HVAC is most likely the culprit. Windshield Defroster and heated seats, rear defroster are other thing using traction power.

 

I finally got around to digging through my Hybrid Assistant records from a recent trip. Here is an example - a few hours on the hightway at 73 mph, SOC stays almost flat. A bit goes into the battery at the end when I slowed down, probably for a rest stop.

 

i have to think user error. software glitches and model year differences are uncommon to the point of non existent.
but i can't figure what you might be doing wrong