Air UK used to put water methanol in the F27s at STN...
...and at SOU, JER, GCI, ABZ and everywhere else there were engineers. At SOU and GCI it had to be used on most take-offs and at other stations it all depended. From memory, Herod's figures are about right and we regularly had to account for W/M in order not to exceed our MLW. But I think reliability was questionable. The age of these things meant that tailplanes became loose (G-BYOD), the pneums escaped, spiders, rats and flies got trapped in places you never knew existed. The engines were thirsty (even Mod 1830) but reasonably reliable but overall, they were somewhat over-built. I'm therefore quite shocked to hear one has shed a prop.