Poor traction / gas mileage after accident

Does it get significantly lower mpg now? Who repaired the damage? The first assumption is some kind of drag exists caused by the collision. Brakes, bearings or transaxle.

If there are warning lights, you would need a specialized hybrid capable code reader along with some knowledge of the hybrid system. Typically mpg losses not related to drag include a weak 12v or hybrid battery.

 

You can't judge by instantaneous mpg. You need to go by average mpg, ideally comparing a reset trip meter against the overall average mpg. I doubt you are anywhere near 22 mpg, bad is usually 35-40 mpg average.

A typical bearing failure will have a characteristic rumbling that gets louder over 35 mph. It may be quiet for the first mile when cold. Typically in a Prius, normal road noise at 60 mph and higher will drown it out. Someone may need to remove the calipers so that they can be inspected and the hub bearing can be rotated without brake drag. Then compare.

But first be sure you have a problem based on average mpg. Often noise is subjective.

 

Normally modern integrated hub bearings do not exhibit a lot of loose wheel symptoms or slow hand rotation noise. Bearing rumbling at speed can sound like a rough concrete road as well so having a smooth asphalt road to use for the noise is best. Even with bad bearings I would never expect to see average mpg drop to the twenties.

Many front end suspension shops could check the basics, probably with a free estimate. Just be careful of a bad strut diagnosis, easy money for them and unlikely to cause your symptoms.