The spec in question is normally called the H-Point. Below is C&D referring to it in a review. For comparison, my wife's Soul has an H-Point of 24, and my very small pickup truck 28. It's a major pet peeve of mine that car manufacturers generally don't publish H-Points in their online spec sheets. Of course, an H-Point kind of depends on (how to put this discreetly) the size of one's posterior "muscles".
"Chevrolet calls the Bolt a crossover, a claim that we dismissed as marketing bluster at first. Clearly, the Bolt looks like any other shoebox compact. But there’s actually some credence to Chevy’s claim. From a functional perspective, a crossover is defined in part by a tall seating position, which is quantified by the distance from the ground to the driver’s hip, a measure known as the H-point. While the Bolt doesn’t appear to have the ground clearance of most crossovers, the underfloor battery pack elevates the seating position. At 25.5 inches, the Bolt’s H-point is closer to a Toyota Highlander’s 28.6 inches than a Volkswagen Golf’s 20.8 inches."
http://www.caranddriver.com/chevrolet/bolt-ev
also
https://en.wikipedia.org/wiki/H-point