This efficiency was determined based on a draft methodology that has since been changed. The final method called J1711 was just recently approved by the SAE and will be used to determine the Volts’ mileage rating. The method continues to take into account the effect of nightly charging for a plug-in hybrid, and thus to some extent the average fuel economy over time, though has not yet been made public.
At yesterday’s conference when GM announced the Volt’s battery pack would be fully warrantied to 8 years or 100,000 miles, journalists asked what the Volt’s final overall mileage estimate will be.
“We just don’t know right now,” said Micky Bly, GMs director of EVs and hybrids .
In an exit interview with GM-Volt, former GM vice chair Bob Lutz said “the one thing we are reasonably sure about it whatever label we get will be triple digits,” admitting GM had jumped the gun on the 230 announcement.
Even with the new method, the debate rages and will go on between GM and the EPA right up until the point of sale in November said GM vice chairman Tom Stephens.
“We’ve been working collaboratively with the EPA and the industry to come up with a number that gives our customers something they can feel comfortable with,” Stephens said.
It may not be as simple as displaying miles-per-charge in charge-depleting and miles-per-gallon in charge-sustaining mode. People who charge twice per day or almost always drive less than 40 miles per day may burn gas so extremely rarely that generator mode fuel economy will become exceedingly unimportant for them.
In fact, according to Stephens, the EPA is considering for the Volt replacing the standard city and highway sticker with a fuel economy table illustrating expected fuel economy in several different driving distances or scenarios.
And for those who havent seen it, GM rolled out the first public version of a Victory Red Chevrolet Volt, captured by our friend Sam Abuelsamid of Autoblog who was lucky enough to attend the battery conference in Michigan. See photos above and below.
This entry was posted on Thursday, July 15th, 2010 at 6:20 am and is filed under Efficiency. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.