I bought a couple of motorbikes when i was in England, mostly because where i worked there were long queues of cars to get into the town and because the motorbike rules are different to here i could get to work in less than half the time. In England motorbikes filter to the front of traffic queues or lights.
I thought i would also save petrol too but my last bike was a Kawasaki 750 and I had to forget fuel economy because those things just don't go slow - especially out of town in the twisties.