MG. I wasn't thinking of just every day riding but in Lee's case IRON BUTT.
Of all the iron butt races only eight have been won by air cooled engines. In 1993 the only Brit to ever win rode a 1983 MKlll Guzzi over 12,000 miles. Only Guzzi to win also.
1985 was won by a Suzuki GSll50se
The other six were BMW, oldest being a 2000.
My point is the at at 10-14,000 miles per event, averaging 30-40,000 miles a year in training and smaller runs the air cooled unitsd of all makes do not seem to make it to the top of the runs. Just a point, not a judgement.
Peace be upon all air cooled motorcycle lovers.