Depending on what you eat but here's an Interesting
Article
From another forum.
The average price of U.S. gas is $2.66/gallon. We can go 20.36 miles on $2.66 in the average car, how far can we go on $2.66 with a bike figuring 10 mph @ 528 calories an hour.
"MPG of bicycling" (i.e., miles a cyclist can travel on $2.66 worth of food)
6.1 miles - salmon or catfish (farmed)
8.3 miles - Big Mac
12.9 miles - ground beef (85% lean)
16.2 miles - chicken breasts (boneless)
18.8 miles - cheese
26.6 miles - Cheerios
46.1 miles - potatoes
68.6 miles - peanut butter
70.4 miles - oats
81.6 miles - pinto beans
94.1 miles - rice (white or brown)
So if your food fuel comes from the items in the first section, it actually costs you *more* to bike than to pay for gas.