MPGe at Various Speeds
First let me thank gm-volt.com forum member "Fluke" who gave me his old "TED" device for measuring juice going to my 240 volt EVSE. He even paid for shipping. He had a new TED and no longer needed his old TED, which was perfectly good, and he offered it up on this forum. Thanks Fluke!
I promised Fluke I would use it to test MPGe at various speeds and publish the results here, so here you go:
Each data point was measured on the same 11.3-mile round trip, so elevation/terrain was not a factor. 1.6 miles of the round trip are on a side street max speed 35 MPH, the remaining 9.7 miles of each round trip were on a country road at the speed indicated in the chart. I used the TED to measure how many kWh it took to re-fill after each run.
The two main takeaways I see in this chart are:
1. Not a lot of difference between 25 and 40 MPH. If you have the choice of routes with speeds in that range, you might as well choose the route with a 40 MPH speed limit.
2. For anything over 55 MPH, the line drops steeply. And over 70 is horrible.
So to me there are sweet spots at 40 and 55 that give you the most bang for the buck, i.e. the most speed with least hit to MPGe.
The main variables and caveats:
- MPGe calculation assumes the EPA standard of 33.7 kWh per gallon of gas
- I was carrying the weight of 66 miles worth of gas in the tank on every trip
- Windows up, no climate control.
- No radio, headlights, or other accessories.
- Tires inflated to 50psi.
- No passengers, no cargo.
- Temps varied between 53 and 82 dregrees on the test runs, with most in the low 70s.
Personal best: 72.9 miles (One charge only, no Mountain Mode, no gas, no significant elevation change.)