Off the top of my head ~40 US gal, based on the number of empty 20L methanol drums I think I have in the shed.
That number does seem a fraction low, given I ran the 600cc fuel tank for a few years before switching to the 360cc fuel tank and clocked up a few hundred flights (full tanks, not schedules) per year.
New head just turned up in this morning's mail, so I've got something to do when I get home from work this afternoon, if it's not pouring rain like it is now...
Quick Update: New head assembly installed, lawn fertilised and had 20mm of rain to water it in. At least the lawn mower runs ok, touch wood...
Last edited by bjr_93tz; 03-14-2017 at 02:00 PM.