Why do Toyota Priuses drive so slowly?

With the instantaneous MPG feedback display, a Prius driver knows just what effect their driving style has on their fuel economy. So, it is possible that the Prius driver is driving more judiciously to conserve fuel.

Then again, not knowing where you are seeing these vehicles, perhaps there was a construction zone there that you missed or poor road conditions that forced the traffic speed to be less than the posted speed limit.

You may also be experiencing an availability heuristic… You may recall seeing Toyota Prius going 15mph in a 35mph zone, and from then on you only recall other Toyota Prius doing the same, but you subconsciously ignored all the other types of vehicles doing the same speed in the area.

cuz toyota prius is hybrid car. hybrid so slow.

No modern car is ever slow by itself. It’s the driver that decides to go slow or fast.
If the Prius’s were going that slow, the drivers were probably trying to see how much mpg they could squeeze out of their cars. We’d probably do the same thing, if we bought a car that is supposed to give the very best mileage of any car made, we’d be driving like 100 yr old grannies to see if we could do even better, just as a test!!

Cars that use only electric motors are slow only if they are limited in their speeds. The Tesla car is a sports car that has ONLY electric motor, and it zoooooms at up to 100mph. electric motors can be made even quicker than gasoline engines in some cases. Race tests have been done on race cars and racing motorcycles, and the electric versions are virtually just as fast as gas powered.
That’s why “green” people are so eager for electric-only cars, because they CAN be as quick and fast as gasoline cars. The only problem is having enough batty power to fuel the electric-only vehicle. Range is still the short end of that problem. If they can get ranges up to 250-350 miles for electric cars, without having to tow a trailer full of extra batteries, then gasoline engines will be seriously challenged.
The other problem is generating all the extra electricity for all these wonderful electric cars to be charged on. Everyone green screams at using petroleum for gasoline, but never consider that coal and oil are used for most of our generating plants, thereby passing on the cost and pollutions. We want more electricity to charge up our really nice electric cars, but still have to use coal or petroleum to burn to make it.

So if you see a Prius being driven like it’s stuck in mud, it’s only because the driver is a “stick in the mud”, and won’t go any faster.