Yeah, the article mentions that the VX is governor limited.

Which reminds me of something at work recently. We now have an Isuzu NRR TurboDiesel box truck. My supervisor (who calls everybody else an idiot all the time) took it to Tallahassee and had a fit because every time he set the cruise control it dropped back down. He stopped about a dozen times on the way back, checked the oil, etc. All it was is that he kept trying to set the cruise control for a speed over the amount the speed governor would allow. Never crossed his mind, and it was funny as could be. This guy supposedly used to work on airplanes and helicopters in the Navy. Good grief. Especially when he told the boss and the boss figured it out in a nanosecond and consequently learned was trying to exceed the speed limit. The guy has had several accidents and it's a wonder he still has the job.