i do commute 95 miles a day, 5 days a week, and about 10 months a year. i don't ride in rain or extreme cold below 50 degrees F or extreme heat higher than 100 degrees F. i get about high 38 mpg on my bikes both 750 and 550. if i were to drive my Honda Element, i get about 23 mpg. i don't follow strict oil change schedule on my bikes, may be about 2000/2500 miles per oil change. i have 4 bikes to ride and take turn commuting on them, so that i don't rack up so much mileage. all in all, money saving on gas is there, considering maintenance expenses, ie. registration, insurance gas, oil change, chains, tires, etc. as compare to driving. math breakdown will give you snapshot of your situation