I've now hit half a tank of gas with using the PHEV for nearly the whole time (had one or two trips beyond the kit's range). Last fill up was 9/4 and its 9/14 today. I've been averaging around 100 mpg on the way in to work and in the mid 70s on the way home. Every once in a while the wife takes the car and that drops things down a bit. The tank is currently at 75 MPG according to the onboard MFD and slowly climbing.
As I was commuting to work this morning it was about 45F out. My commute is 7 miles long. First I have a short jaunt in town (in EVv mode) to a 45 mph county road (hybrid mode) then back to a short jaunt in town (mostly all electric) to my workplace. Today I noticed that getting to the town my workplace is in, my coolant wasn't even up to 155F yet (this is necessary to engine off consistently in the Prius). So, this fall and winter heating will definitely be a huge deal for me. Once it gets down to around freezing (37F I think), EV mode won't be even be available. The Prius simply doesn't let you hammer the batteries when its that cold out. So, I'm going to have to start blocking more of the grill (upper grill isn't blocked at all ATM), and using the block heater pretty soon.
I've had some issues with the coolant hack and it is currently not working. It will be a necessity with the PHEV to get as much engine off as I can.
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