Abit off subject but the townmate does about 100 mpg in stop start traffic and then cruising down country lanes at 30mph will do 140 to 160 miles to the gallon just use gentle throttle control and don't brake hard and accelerate hard.
Nope Yamaha Townmate bigger fuel tank than a C90 but best I got was 160 miles out of a gallon tank, going very steady and quiet roads down to Measham 4 days a week from Nottingham 62 miles round trip. 2 days and one morning trip before filling up.