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Is the EV range display just a guess based on temperature?

4085 Views 15 Replies 12 Participants Last post by  hellsop
What determines the EV range that is displayed? Is it just a guess based on the temperature or is it somehow constantly adjusting based on driving habits, temperature, etc.?

When I got my car in October the EV range went as high as 57 miles while it was in the 60s and 70s outside. Yesterday I ran the car to 0 EV range and drove on the ICE so the battery got a full recharge last night. Today it's about 52 degrees outside and the car is only showing 40 miles EV range.

I'm wondering if this is just the car guessing based on the most recent conditions and after I drive it and recharge it today the range will actually increase... or is this the actual max range I will get right now? Is the car just assuming that I will use the heater, heated seats, drive a certain way, etc. and combining that with the air temperature to say 40 miles, so if I were to drive without the heater on I would get more?
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A range estimate is simple math: average mileage x available fuel.

The full charge range estimates and the "as you drive" range estimates employ different methods of calculating average mileage.

The algorithm used to create the full-charge, or start of day average mileage estimate, is based on historical driving data, weighted for recent data, and tends to be fuel-specific. Last night’s temperature impacted the mileage you got while driving home last night. That mileage plays a greater role in today’s start of day average mileage estimate than does this morning’s temperature.

If ERDTT and short distances driven on a cold engine are your only use of the ICE, your start of day gas range estimates will be low, even with a full tank of gas, based on this recent low mileage use of gas.

Of, if your electric driving is very efficient, but you only drive 10 miles a day, your fully charged Gen 2 Volt might show a full charge ev range estimate of 70-80+ miles, based on your efficient short-distance ev driving.

Once you start driving, mileage estimates change, based on "on the fly" environment, terrain, power used for accessories, and driving habit data feedback. When driving on battery power, the ev range estimates change both as fuel is consumed and driving efficiency is modified. Note that the "on the fly" data feedback may also be applied to the average mileage estimate of the fuel not being used, producing a change in the gas range estimate, even if the ICE is never turned on.

My 2012 Volt has no Hold mode, so I do not know if the reverse is true, if the ev range estimate would change, based only on "on the fly data feedback" while driving in Extended Range Mode.
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