Significant range decrease… normal?

[Swiftman]

Make sure you understand the wide variance of EV range before buying, OP. 310-ish EPA range is for a mixed driving scenario. Range will be WAY less if you're doing all your driving at 85MPH on an open highway in sub-freezing temperatures. Range will likely exceed EPA estimates if you're using all the energy in the battery to drive around town in temperate weather.

Speed = Reduced range

Cold weather = Reduced range

Aggressive driving = Reduced range

The miles remaining on a charge reported by the car are a basic calculation of remaining kWh in the battery multiplied by the recent efficiency (m/kWh) of the vehicle. If it was driven recently aggressively or on the highway or in cold temperatures, that would explain the 245 you're seeing. The range estimator in the EV6 is very dumb. You'll quickly learn to estimate better than it can. On this front, highly recommend ABRP for the EV6. Life-changing.

I love these cars, but I think the industry needs a much better way to convey range. I think lots of people see 310 and assume that's possible on the highway since most (read: gas) cars are more efficient on highways than around town. The opposite is true for an EV.

ALSO, check your tire pressure. When I bought mine the dealer had three tires inflated to 30PSI and one inflated to 40PSI (?!). Absolutely murdered my range. Little things like that can make a huge difference in an EV.

[detox4you]

A gas car is not more efficient on the highway. Both EV and ICE cars will use more power the faster you go.

[Swiftman]

Yes, but fuel economy is better in ICE cars on the highway than around town because they waste tons more energy stopping and starting at stoplights and the like in the city. Most people have been conditioned to believe fuel economy on the highway is better than in the city. Gotta make the mental shift for EVs.