2017 F3L here. Just rolled past the 20,000 km mark (13,000 mi). Random checks over past two years show we are averaging 6L per 100 km, or around 40 mpg US. Lately, we have been getting closer to 43 mpg US, or around 50 mpg using Imperial (British) gallon. That's riding two-up about 80% of time on gently rolling back country roads, mostly doing 55 mph, or so. We don't poke along, but also don't do burn-outs or push it hard; we challenge the 'twisties', but don't push the edge. Hauling our light trailer occasionally drops the mileage by 20%. Good weather ryding, 70's/80's, using 91/93 octane fuel. Riding split between ON and FL, with a few places in between (hills of NC, VA, WV, TN, SC). On the few occasions when we/I have been on the Interstate or super highways, travelling 65-85 mph, fuel consumption has markedly increased, although I cannot recall ever being worse than 32/33 mpg. Maybe we're just lucky, but love the way our F3L performs.