I ride 44 miles round trip everyday to work. When gas was $3.05 (it's almost $4.00 now) I would spend about six bucks a month for my MB. And that also includes riding for fun. In my truck, just to go to work and no where else, around $90.00 a month.
I spend more on fuel for my truck in one month, then I spend a year riding my MB to work. I save around $1000.00 a year, That is HUGE saving's.