The hybrid which recharges it's battery using the gasoline engine and the PLUG IN hybrid that can either recharge the battery by plugging it in or using the engine are different animals.
A hybrid car with an Atkinson cycle gas engine will make considerably better part throttle mpg than an ordinary car on a long steady speed drive as well as in stop and go town driving.
The Atkinson cycle gas engine makes great cruising mpg, but can not make as much wide open throttle power as a similar size conventional gas engine, thats where the battery powered electric motor comes in. The electric assist is there to help accelerate, merg, pass like a car with a much larger engine. It also allows the gas engine to shut off and consume no fuel when coasting or stopped at a light. Add to that the energy saved by regenerative braking, which slows the car by recharging the battery instead of wasting it as heat from the brakes.
I have a 2010 Toyota Prius hybrid, it averages slightly better than 50 mpg at the highway speed limit. It weighs 3300 pounds, seats five 6ft+ people in comfort, and being a hatchback, with folding rear seats, has lots of cargo room.
In spite of the 3300 pound weight, it goes 0-60 in 9 seconds and runs 115 mpg if you care to do it. It has been totally trouble free, the only service has been to change the synthetic engine oil every 10,000 miles. That oil still has the color of honey at 10,000 miles.
Toyota guarntees the hybrid system including the battery for 100,000 - 150,000 miles, depending on which state you live in.
No one knows how long that NiMH hybrid battery will last, but there is a taxi co in Canada running a fleet of Prius taxi's. They have yet to have a hybrid battery fail with between 200,000-300,000 miles on the cars in taxi service which beats the hybrid system hard.
I normally get a bit better than 50 mpg average on public roads, but last summer we drove the 35 mile loop through TR state park, where you do a lot of stop and go driving and never exceed 35 mph, The Prius made a bit better than 90 mpg on that slow loop through the park.
Atleast so far (2 years), it is the best driving and most reliable car I have owned. Only car I have owned where you can drive it all day without getting stiff sore tired. The seats and controls are just right.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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