[adrianN]

And yet combustion vehicles don't have 2000 miles range. Energy density is very important, but you can make up for it with better efficiency.

[ams6110]

Only because they don't need it. Most people are comfortable with a ~300 mile range, knowing they can refill in 5 minutes. So most cars are built with 10-to-15 gallon tanks.

Build a car with a 30 gallon tank and you could easily be in the neighborhood of 1000 miles range.