I agree, although the appropriate prefix is probably kilojoule. The prefixes in both numerator and denominator are redundant, but may seem "more useful" to the average person. My basis for the kilojoule. Approximate specs for the Volt are 8 kWh battery (28.8 MJ) and 40 miles (64 km) on battery alone. These may be "best case" but they yield 450 kJ/km. Gasoline and diesel mileage may be similarly expressed. Using DoE typical LHV heat values, gasoline consumption of 8L/100 km (close to current CAFE) yields 2.6 MJ/km. (yes I know LHV heat value is redundant; it looks naked without it)
--- On Thu, 8/27/09, STANLEY DOORE <[email protected]> wrote: From: STANLEY DOORE <[email protected]> Subject: [USMA:45696] Wh/mile vs J/km To: "U.S. Metric Association" <[email protected]> Date: Thursday, August 27, 2009, 7:55 AM Dear Metricators: Use J/km rather than Wh/mi as some news media are beginning to use. Here's a chance for USMA and others to promote and use of the SI. What do you think? Stan Doore
