Mileage in the 20's with extreme cold and snow

Need more info.

How long is the trip? If you're going 50 miles, that's low. If you're going 5 miles, you're kicking butt.

Most cars sacrifice MPG on the first few miles to get the engine temperature high enough for good MPG on the rest of the trip. The prius takes that to an extreme. When the starting temp is very low, and you are competing with the engine for heat, that warm-up period gets drawn out over more miles. At some point it is cold enough that the engine doesn't complete warm-up before arrival, and your MPG is hosed until the weather gets warmer.

Engine block heaters and grill block panels are two different solutions to this problem. Both have their ups and downs.

Also check that tire pressure. In cold weather they all go soft, and a Prius is very sensitive to it. More air in the tire = harder ride & better MPG.

 

Sounds a bit low, but not that unusual for cold winters.

PS
Any snow hanging under the car or packed in the wheel wells? That could add as much as a few hundred pounds.

 

It's a bad time of year to worry about gas especially with it as cheap as it is. Keep warm and check it over several tanks, winter snow and cold suck.

 

come down to florida, getting 44mpg on the hycam!

 

Yes, I would say that's normal. You can't really look at the MPG during the current 5 degree temperature mess out there.

My 2014 Four gets 40-42 mpg when it's this cold. Normally its 46-48 mpg.

My Ct200h (fancy Prius) gets 43 mpg, now its down to like 35 mpg.