Quote:
Originally Posted by 04_Sentra
Personally, I don't like any of the methods of calculating mpge.
Life Cycle Energy Equivalence - Unfairly compared Well to Wheels for EV to Tank to Wheels for ICE.
CO2 Equivalence - Makes an assumption on where I get my electricity and it's CO2 content.
Cost Equivalence - Makes an assumption on how much I pay for electricity.
Direct BTU Equivalence - Gives unrealistic expectations on the range and cost of operation for EVs.
What I need to know is capacity of battery pack in kWh, and "fuel economy" in wh/mi, and I can figure the rest out.
|
I don't like the term "mpge", because wh/mi can not be made
equivalent to mpg. Certainly not universally. Still, you can do a weighted average of the above methods, tailored to your specific situation and values. You can also make some reasonable assumptions about people's values, and you'll come up with a figure that's about half of the direct BTU mpge figure.
Let me stand up for the first two methods.
Life cycle energy equivalence: I have presented well-to-wheels data for gasoline (not tank-to-wheels), and well-to-plug data for electric, so you must measure power consumed by the charger, not by the inverter as reported on the dashboard.
CO2 equivalence: Considering that electricity is fungible, and we're all on the same grid, grid average figures are appropriate for estimating the impact of mass adoption of EV's.