Making sense of mpg for A3 e-tron
Here are the data from Dash:
1177 miles
57.4 mpg
7.0 m/kWh
And data from MMI:
1000 miles
39% ICE
61% EV
Assuming I have the same 39%-61% ratio for the whole 1177miles, the gas range is 459 miles, and EV is 718 mile.
The gas used is 1177miles / 57.4mpg = 20.5gal, which will result in 22mpg = 459m / 20.5gal, for the gas engine only. This 22mpg is apparently too low, even for gas engine only.
In order to calculate more real mpg for gas engine, I need to know real miles by ICE or EV. I think 7.0m/kWh and 718 mils are both inflated, maybe Audi is adding re-generative braking? However, the electricity 718m / 7.0m/kWh = 103kWh should be accurate, which is somewhat close to the number I got from SoCal Edison.
Assuming 3m/kWh for the EV driving, the real EV range is 308miles and gas is 869miles. Therefore the real mpg for gas engine only is 869m / 20.5g = 42mpg.
The other way to look at real mpg without the 3m/kWh assumption, is to use 0.15$/kWh for charging at home, and 4.00$/g for gas price. In this case, the equivalent gas for the 103kWh is 3.8gal, which give me total of 24.4gal equivalent gas for the total 1177 miles. In this case, I got 48mpg for the ICE/EV combined.
A few words on my driving condition.
For commute only.
50mile round trip in LA traffic on 405, mostly in hybrid mode.
Charge overnight at home only.
Here are the data from Dash:
1177 miles
57.4 mpg
7.0 m/kWh
And data from MMI:
1000 miles
39% ICE
61% EV
Assuming I have the same 39%-61% ratio for the whole 1177miles, the gas range is 459 miles, and EV is 718 mile.
The gas used is 1177miles / 57.4mpg = 20.5gal, which will result in 22mpg = 459m / 20.5gal, for the gas engine only. This 22mpg is apparently too low, even for gas engine only.
In order to calculate more real mpg for gas engine, I need to know real miles by ICE or EV. I think 7.0m/kWh and 718 mils are both inflated, maybe Audi is adding re-generative braking? However, the electricity 718m / 7.0m/kWh = 103kWh should be accurate, which is somewhat close to the number I got from SoCal Edison.
Assuming 3m/kWh for the EV driving, the real EV range is 308miles and gas is 869miles. Therefore the real mpg for gas engine only is 869m / 20.5g = 42mpg.
The other way to look at real mpg without the 3m/kWh assumption, is to use 0.15$/kWh for charging at home, and 4.00$/g for gas price. In this case, the equivalent gas for the 103kWh is 3.8gal, which give me total of 24.4gal equivalent gas for the total 1177 miles. In this case, I got 48mpg for the ICE/EV combined.
A few words on my driving condition.
For commute only.
50mile round trip in LA traffic on 405, mostly in hybrid mode.
Charge overnight at home only.