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When I drive on the highway, it is usually around 55MPH, though when I can follow someone (to lower the wind drag), I go up to 65MPH if that's what it takes to stay behind them. My spouse and son both drive faster than I do.
It depends completely on air temperature what your actual range on the highway will be. Cold air has significantly higher density, and if you have to use the heat, and/or the battery pack has to be warmed, then the range is affected.
The WORST range we have see was driving at 55MPH when it was about 9F and gusting winds. We saw about 150 miles estimated (the median number). There were four people in the car, and we needed seat heaters (which have minimal effect) and the defroster to keep the windows clear - which used about 25% of the total energy! The batter conditioning (heating) took another ~8-10%.
The EPA range on the Bolt EV is 238 miles (not 255 stated above).
Air conditioning is not as hard on the range as heating, so until you drive 75+ and crank the A/C down to 68F, you could probably do 200+ miles. Run the A/C at 78-80F (which dries the air) and keep it 55-60MPH, and it should do fine.
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