I would recommend taking in account the cost of deicer, gas and what your time is worth (and whether or not you're going to charge by inch or by time). The first season is going to be a educated guessing game, you definitely don't want to bid too high or too low. The best option is to make sure your customers understand all that you and your company have to offer. Do you guarantee their satisfaction? Does your company place markers out to ensure the correct paths are being plowed? Is your company the best option in town? Let your customers know the answers to these questions, because if you do find out that you will need to make more money next season they'll understand that you're the best company for the job when you have to increase your prices.
Best of luck to you!