It seems if you're an Aussie Truck driver, you need to take four 15min breaks in an 11hr shift. So that's 2hrs of driving, 15min break, repeat. This helps to ensure alert drivers, and safer drivers. From this, I propose that taking a 20min break every 200miles is not only feasible but crucial to ensure alertness, for any solo driver. Yes, if you alternate drivers you could get there faster on a longer distance tank, while still giving enough rest to the each driver, but I don't see "I won't buy this low emissions vehicle because when me and a mate drive we have to stop and refresh, rather than just switching drivers."
Side note: If you don't have rules in place for your employees or coworkers about taking a 15 minute break every 2h15m, to quote an Australian road safety campaign, "you're a bloody idiot." A car is the most dangerous machine in your organisation.
I realize that in the US for example, you only need one half-hour break in an 11hr driving stint, and even that has had some organizations try to remove it.