I do not think these are made by Malvin Star, they are just being sold with Malvin stars in the ad. They were sold with all kinds of bikes and by them selves.
So, 120 miles on a tank. That would take you from Bris Vegas to the Gold Coast.
The engine would struggle when towing the caravan though ... frown
This little source I found has a report from back in the day that says it is more like 160 miles per gallon, so probably only 80 miles. Still pretty far for the little thing.