• mbherm avatar mbherm Posted: 1/9/2012 11:42pm PST

    Ok, a better article might be to do a test to determine 'normal' mileage if you use the Mountain Mode recharge process to capture these 'free miles'. Based upon previous other postings, the Volt can get into the mid-40s MPG on the ICE in Extended Range by actively using mountain mode. I stared doing so on my 164 mile commute (going to normal mode when driving under 55 MPG and mountain mode above such as much as possible). Doing so, my total gas consumption dropped from a high of just over 4 gallons to a low of exactly 3 gallons (same 164 mile one way trip starting will full battery obviously). By the way, there is significant incline/decline during such which adds about 3 miles of range on the backside.

  • fb_100001250461516 avatar Dave Posted: 7/20/2011 10:35am PDT

    It's not "free" miles. Regen occurs due to two situations - (1) deceleration after a previous acceleration or (2) a downhill run after an uphill climb. due to system efficiencies, you get back some of the energy you expended. It's the normal result of good hybrid operation.
    Now in the Volt case, If you spent your electric battery climbing the hill and then it kicks into gas mode on the downhill, then your ICE MPG will look great, but, you still paid for it with your electric charge. Do your own system analysis on other possibilities, and you can get a wide variation in result for either the electric or gas portions of your Volt trip if it envolves both modes in unequal terrain conditions.

  • fb_100002544459353 avatar Ramon Posted: 7/19/2011 9:53am PDT

    Just exactly how is it possible for the EPA tests to "avoid" the recapture capability? They are driving
    the car and measuring the gasoline consumed, thus should certainly be including any regen benefits. They do so in their city mode, obviously, otherwise their mileage would be far less. If, in fact, they are somehow not taking regen benefits into account, that mean their tests are invalid. Give them a call, see what the morons say. It only took them 2 years to
    figure out that MPG doesn't apply to EVs.

  • fb_100000574575565 avatar Jp Posted: 3/20/2013 7:19pm PDT

    Ramon, turns out, the EPA does not drive the cars. It is ALL done through a computer simulation. That is why it misses the regen miles after gas engine cuts on.

  • john_v avatar John Posted: 3/21/2013 4:49am PDT

    @JP: Not quite. Manufacturers submit their fuel-efficiency data based on emissions calculations. The EPA reserves the right to test any vehicle at any time, but in practice it tests only 10 to 15 percent of the vehicles on sale in any given year. FYI.

  • fb_100002441833924 avatar George Posted: 7/19/2011 11:01am PDT

    @Ramon,
    The EPA cycle does not include anything like significant hills, so there is little downhill to strongly recapture battery power. There are a number of stops, but that will produce relatively little in terms of strong regen compared to a mile or more long downhill.

    Felix Kramer commutes from SF to Lake Tahoe (6000') at least once a month; he has reported to me getting 50+ mpg for his ICE segment of that trip DOWN from Lake Tahoe since so much regen occurs and adds "free" battery miles that are recorded on the Volt display still as ICE miles.