Larger bikes weigh more which can take away their power advantage (in reference to fuel economy). If there was one thing I would never do is P&G a motorcycle. During a long glide you can't really shift to neutral in a sequential transmission and holding the clutch will wear components quickly. Bump starting the engine can be dangerous if you pop the clutch on a slick spot.
Smaller bikes are way more efficient at lower speeds. Larger bikes are typically more efficient than smaller bikes at higher speeds. A rider needs to size the engine of his/her bike to the kind of riding they plan to do. If it's all city, low speed and stop and go a small scooter or motorcycle would suit better than a heavy big bike since the small bike would be lighter, nimble, and use less fuel during idle. If there is a lot of high speed interstate travel a larger bike would suit better since they have the power to maintain the speed, are more comfortable cruising and have a larger capacity fuel tank for extended range.
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