We have gone to "renting" now. Mostly good. We chartered a 26' center console for day cruisng in the BVI's last spring break and it had a 2 stroke yamaha outboard, big engine but the oil injector was bad and the alternator was not charging (as I learned). My fam talked me into getting pizza when I knew we should be headed back to port before dark. Well it died, I mean dead, no electric power. I had a cheapo baofeng programmed to marine freqs and a Garmin hand held. My wife for some odd reason had a really bright LED light that flashed red too. We marked our spot and called it in. Thought we better look into putting on some life jackets, they were rotton. We drifted over 2 miles, right between virgin Gorda and the dogs. The guy who showed up to tow us in was "carribean drunk". FUN TIMES!!
I chose the AFFF due it's ability to clean up easy. Plus, the wetting agent has a added benefit of dropping temps to below flash point quick. In my "imaginings", I could see my jeep with it's hood pinned and no way to get an ABC or halon to the source. I also put one nozzle right over the gas tank. Just in case.