Just visiting and found this thread. My current thinking is to scale the numbers of the 'fraction' fits in the 'integer' MPG value. Two approaches:
- 10*miles - this will bring mileage into the typical 40 MPG range for many EVs.
- 0.1 * kWh - achives the same effect of scaling to ordinary MPG values.
In a perfect world, the energy content of a kWh in gasoline gallons would be used, 33.70 kWh per gallon. But such calculations should be done in the application and not require the user to handle the conversion factor. Using a factor of 10 will be off by a factor of 3.37 but at least giving values in a range consistent with the middle range of ordinary gas cars. For example, my Standard Range Plus Model 3 is rated at 25 kWh per 100 miles, 4.0 mi/kWh.
- 10 scale factor -> 40.0 MPGe
- 33.7 scale factor -> 134.0 MPGe
I would prefer an accurate metric, using 33.7, but a factor of 10 at least brings it into the realm of understandable by ordinary folks.
Bob Wilson