My workplace is 3.8 miles from my apartment. I'm a cyclist. I leave my place around 6am when the traffic is light and the temperature low in the summer. Its a very pleasant ride to work in the summer. I don't have a problem taking the route with my bike in the winter. I did it every day 3 miles in windy city chicago where there was slush. But I could live right downtown and be within walking distance.
Other than that I bike for my regular places like the gym and for groceries both are close. Or I can coordinate trips with my roomate or coworkers. My coworker lives just down the road so I can choose to ride with him to work and back if I want too.
Also there is a bus and taxi service in Casper. Also there is a couple rental car companies. Even if I rent a car from these places 3 days a week Id be saving a lot on owning a vehicle, gas, maintenence, taxes, registration, insurance, the vehicle itself.
I don't need a car living in Casper and I wouldn't need one in Cheyenne either. You have that option when you are in good shape and have a nice bike

. That said, I will be purchasing a small truck because I am a sportsman and will want to bring my bike or kayak or canoe or atv along where I go. But even so I could rent a truck from enterprise. My work has a corporate account there I can use. So all in all it isn't necessary.