Well you didn’t specify additional cargo or other reasons for limitation.

For example if the issue is travel time: electric motorcycle if the issue is cargo: electric bike with travel trailer if both travel time and cargo: gas to electric conversions are affordable (with the batteries being the highest cost [and the determining factor for range])

basically the less mass needing to be accelerated, the less energy required. The lower the acceleration acceptable, the less energy required.

Treat it as an engineering problem to solve or improve upon.