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As an individual owner I want to set a goal of a potential 500 passenger miles per gallon for all my motor vehicles. Currently my car and van are at 175 pmpg with the 5 seat, 1.6L Prism getting 35 mpg and the 7 seat, 3.3L Caravan at 25 mpg. A car would need to get 100 mpg and the van 71 mpg. Since most people travel alone, a 500 mpg motorcycle would be an excellent vehicle for trips more than 25 miles. Any distance less than 25 miles a faired bicycle is more cost efficient. The CBR 250R is a good candidate for 175 mpg with a full fairing system.
All consumer costs need to be considerd in average annual cost per mile over the life of the vehicle. I look at ABC ratings on the tire sidewall for treadlife and maintain tire pressures.
In the macro setting, energy use and pollution per million miles traveled my be the Green yardstick. This might include manufacturing, operation, and disposal of transportation systems. Right now the school bus may be the leader in passenger miles per gallon.
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