I was in Afghanistan last year and they were using only two fuels, albeit off the flight line. Standard gasoline was available, although they were really pushing to ween all entities off of it by 2017. The other fuel was some sort of diesel mix and I had thought it had been shifted to TS1.
I only saw one M1009 while I was there for over a year and that was at Bagram. I spoke with the guys using it and drove it for about a week (swapped my TATA for it). She was beat to ****, but she drove nice and was still running strong and she was always filled up at the fuel depot. So whatever fuel they were giving out was not effecting that CUCV.
Other than that, there were still several hummers left, but they were used mostly by coalition/ANP/ANA troops. The US was almost all shifted over to MRAPS and the like for combat operations. For everyday, around base transportation, we used lots of Landrovers, TATA pickups and a bunch of up-armored civilian made vehicles (the Mercedes G-Wagon was the best !!). All diesel, all used the fuel depot. I didn't hear of any fuel related issues and I smoked cigars and shot the stuff with the head vehicle guy for the theater weekly. We had conversations about fuels, the conversation to a single source, but no mention of high rates of failures (except for some buses).
That said, it was the government running it all and I watched them cut up brand new MRAPS because they didn't want to ship them back, so I guess 50 burned out engines needing replacement per month wouldn't even raise an eyebrow. But hey, what do I know.
Cheers. !