So this is a subject of being frugal in the city when gas is $5 a gallon...
Now a scooter beginning at 50cc engine size gets good fuel mileage but poor performance. And a scooter has small wheels and therefor is not as stable as a motorcycle....
But a motorcycle does not have an automatic transmission. So shift with the left foot while pulling the clutch with the left hand. Brake with the right hand and twist the throttle with the right hand. But the transmission shifting is crude so be methodical with the shifting. Now the throttle is zero power to full power in one-quarter turn...so if the throttle gets away from you just pull the clutch with the left hand.
Now if you find yourself coming into a curve too fast just go ahead and lean very hard and try to make the curve...because a vehicle under heavy cornering loads is slowing down through the curve as it is making the curve. Next...a motorcycle will stop in a very short distance if leaned upright and then the front brake is pulled very hard. Finally it is better to vault over something on a motorcycle than it is to crash into the side of something...
Now for the frugal motorcycles:
The Suzuki DR200SE at $4,199 gets 105 MPG city...
The Suzuki TU250X at $3,799 gets 82 MPG city...
The Suzuki GZ250 at $3,799 gets 82 MPG city...
The Honda CRF230M at $5,399 should get about 80 MPG city...
The Kawasaki Ninja 250R at $4,000 should get about 60 MPG city...
You want a sports car instead ?
The Mini Cooper at $18,550 gets 28/37 MPG...
The Mazda MX-5 at $22,750 gets 22/28 MPG...
The Pontiac Solstice at $24,275 gets 19/25 MPG...