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Generally any bike out there is going to get 30+ mpg or more under normal riding circumstances.

Cruisers and generally heavier bikes are giong to get less than a lighter cruiser or sport bike.

But! Sport bikes can get down to about 10mpg if you beat on em. Most smaller cruisers in the 250-500 range get 40-50 mpg or more. So unless you buy a hybrid car that gets 40+ mpg and will run you about $30.000 USD or more vs a bike which you can get a clean used one starting a $3,000 up to about 10-15 grand if you like harleys.

Hope this helps.

Fuel economy? Yes.

Maintenance costs? Generally not.

Motorcycles get better fuel economy than most cars. They are lighter than cars and have much smaller engines. However, there are motorcycles that only get mid 30's in average fuel economy and there are many cars out there that will get in the mid thirties on fuel mileage, so you need to pay attention.

Motorcycles generally need more maintenance than cars. Motorcycle tires last between 6000 and 12,000 miles on most motorcycles where car tires can last 50,000 miles. Motorcycle maintenance, if you don't do it yourself, is generally more expensive than the same types of procedures on cars - mostly because there are more cars of a particular model and more auto mechanics than motorcycles or motorcycle mechanics.

My Suzuki DL650 gets between 38 and 50 US mpg depending on how hard and fast I am riding and headwinds. My Honda Accord gets 29 US mpg pretty much all the time on the highway. My Chevy truck gets between 7 and 15 US mpg depending on what kind of load I have on it.

I have a Suzuki GZ250 that gets 65 mpg and a 1999 Ford Taurus that gets 24 mpg, also have a 1989 Ford F150 @ 12mpg, 1981 Honda CB750 @ 38 mpg and a 1973 Suzuki GT750 @ 34 mpg

Overall a bike will be cheaper on Insurance Tax and maintenance BUT not fuel depending on what the bike is and how it is ridden - some bikes give very poor MPG.

Bikes re cheaper than cars.

Cars get on average 25 MPG while bikes get on average 75MPG