Reasons you would not get the posted E.P.A fuel economy.
1 – Driving less than 10 minutes at a time.
The first 10 minutes any internal combustion motor is warming up. This is when you get your worst fuel economy with any vehicle.
2 – Your tires are under inflated.
The recomended pressure on the divers door pillar is 35 psi front and rear. To get the best overall performance [ride, handling, tire life and economy] I have and many other owners have found by having the front at 42 psi and the rear at 40 psi to achieve the best results. The tires on the classic Prius and the current model are both designed to hold a max. 50 psi.
3 – Do you push or hold your gas pedal when you accelerate?
If you pushing your gas pedal down and backing off when you attain your choosen speed, you are not maximizing the use of your generator and batteries. The more you push down on the accelerator the quicker the gas motor comes on. With practice you will notice where your foot is positioned on the accelerator at different speeds. If you allow your foot to only go as far as is necessary, you will find that the generator will do more of the work and less of the gas motor will be required
4 – Why you should drive with your windows up as much as possible.
When the weather gets hot we tend to want to put the windows down. By putting the windows down you change the drag coefficents of the car. It is actually more efficient to have the AC on in a current model Prius due to the generator running off the battery pack and not the gas motor.
Andrew Grant is the world’s first hybrid taxi driver. He introduced his Prius taxi to the not-so-mean streets of Vancouver in 2000, and logged 200,000 miles in just 25 months. Andrew’s Prius was snatched by Toyota. The automaker wanted a chance to study the durability of the hybrid batteries and other components, which held up amazingly well. See this video for details. He’s now driving his third Prius. Andrew has taken a break from taxi-driving, and now works as a professional coach helping his clients achieve personal excellence in various fields of endeavor.