Posted by Gerald J. on June 02, 2008 at 21:32:19 from (4.254.70.153):
In Reply to: hybrid cars posted by farmer boy on June 02, 2008 at 18:27:42:
Friend has an imported hybrid mini SUV. Gets all of 30 MPG. I get that or slightly better with my stock gas VW Golf that I bought with 50K miles on it for $10,400. The price difference to a Prius buys a lot of fuel.
Engine in the Prius is not a standard 4 cycle engine. It has a modified cycle that gets it more efficiency. Another friend with a Prius claims 60 mpg with 4 adults on long trips (like Iowa to Pennsylvania). The Prius engine has a 12:1 compression ratio, but that would ping on regular gas so the intake valve is held open for about half the compression stroke making it compress 6:1 but it gets to expand the burning fuel over 12:1 and that extracts more energy from the fuel.
That modified engine cycle and being able to run the engine at full load or not at all improves highway efficiency.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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