I run Evans in my gasser Yukon (350cid), MBZ300D, my Excursion with a 7.3 PSD, and my diesel generators....I'm a beliver, I'd use it in my pickup (6.4PSD) if it wasn't under warranty and wouldn't be replaced.
The science and engineering behind it is solid, as far as I'm concerned. I haven't had any problems with using it.