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Originally Posted by CGameProgrammer
All cars, including the Prius, do get worse mileage during typical suburban or city driving, unless it's slow enough that they can stay in electric-only mode. Driving in cities sometimes is slow enough, but regular suburban driving is not -- you run the engine much of the time.
Highway driving is much more efficient. I drive from San Diego to LA and back at speeds usually between 75-85 miles per hour (most often at 80) and got 39.2 mpg according to the display. But it went down to 38 after the trip due to city/suburban driving. I get around 35 mpg with non-highway driving.
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Thank you for comments.
However, I think it is dangerous to say "All cars, including the Prius" about city driving.
As you know, the EPA city mileage number is better than highway among HSD(THS) vehicles.
The below chart is the test schedule and it describes a lot of start-stop conditions. In addition to that the city test is done from cold start while the highway test is done with warm engine.
http://www.fueleconomy.gov/feg/fe_test_schedules.shtml
As I posted on others, I think the HSD(THS) system has a lot of advantages and possibilities for the city driving and your theory is not always true.
Ken@Japan
