As per your suggestion favorable number mostly I will prefer 6 (total number of vehicle) among 2 or 5 or 6.
Coming to favorable Color - I see these colors for scooter i.e., Dark Blue, Silver, white, Grey, White. Greenish Blue.
What about Green color because My Ascendant is Virgo. For every vehicle i see half body of the vehicle is Black in color.
Venus is Avayogi Planet for me. Do you want me to prefer White Color and number 6 ?