Prius Prime roadtrips. What was your best range on a full tank?

You mean 950km on a single tank, not 950 US miles? 950km = 590miles. It is doable if you drive conservatively. PP is rated for 640 miles (1030km) with a full tank of gas and full charge using EPA rating of 54mpg and 25miles EV range. But this is to the empty tank. In the real world, your mileage and EV range varies vastly depending on the way you drive and driving conditions. And it is not advisable to drive the car to the empty tank. In my experience, with a speed of 75mph(120km/hr), the car gets ~48mpg and gets ~500miles of range when gas empty light comes on (there is still ~2gal of gas left). So, yeah, if I go all the way to empty, I can make 590miles even at that speed.

 

My best on a road trip was 604 miles (972 km). I thought I must have been about to run out of gas but it only took 10.26 gallons to fill it. I could probably have gone another 50 miles but that really would have been pushing it. I don't like getting below 1/4 tank on a road trip since you might not find a gas station where you think you will. 521 miles was my second longest tank on that 6,000 mile (9,656 km) trip.