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40 or 28 miles? Which AER driving profile did GM choose?

18077 Views 35 Replies 12 Participants Last post by  Tom
What is your normal driving profile? It will have a huge effect on the Volt’s Average Electric Range, AER. Compare three common driving profiles the EPA75, HWY, and US06. We note that these profiles are dynamometer profiles. They are not done in the wind, rough roads, or on road grades, all of which lower AER. Nor are they done with max power (209 motor hp) to simulate passing. The goal of these profiles was to check and compare emissions, not evaluate EV performance, such as AER.

The EPA Federal Test Procedure, EPA75, is called the City Cycle. It consists of the Urban Driving Cycle, UDDS, followed by the first 505 seconds of the UDDS. It has a top speed of 56.7 mph. It uses a maximum of 37 hp road power. See attachment.

The EPA Federal Test Highway Procedure, HWY, has a top speed of 59.9 mph. It uses a maximum of 30 hp road power. See attachment.

The US06 Supplemental Federal Test Procedure (SFTP) was developed to address the shortcomings with the FTP-75 test cycle in the representation of aggressive, high speed and/or high acceleration driving behavior, rapid speed fluctuations, and driving behavior following startup. It represents an 8.01 mile (12.8 km) route with an average speed of 48.4 mph, maximum speed 80.3 mph, and a duration of 596 seconds. It uses a maximum of 89 hp road power. See attachment.

I did a detailed second by second Volt simulation with these three profiles. The results were an AER of 40.2, 39.6, and 28 miles for the EPA75/UDDS, HWY, and US06 profiles, respectively.

Does anybody have a recommendation for a representative EV driving profile? Google did some work for improved EV fuel economy profiles. I'll check into that.

The simulation is attached below.


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Here's a completely unscientific but real world response based on my personal observation...

Today I had a busy day. Busier than usual. I drove to town. I went to Lowe's, Costco for gas, the grocery store, the dentist, and a sporting goods store. I stopped and had lunch at Burger King, then I drove back home. Like I said, this was a busier day than usual. I drove 31 miles and burned about $8.50 worth of gas in the process. So give me 40, or give me 28 miles, I don't care. If I had the Volt today I would have used about 80-cents worth of electricty at my utilities current rate. I would have saved $7.70 and gotten everything done that I needed to do.
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