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 Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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