I worked out a $90 a month savings by riding a motorcycle to and from work 75% of the month.. That wouldn't really pay the insurance and maintenance on another vehicle... BUT, it wouldn't hurt. What hurts is the thought of another payment.
I can't think about riding a ratty old bike with loose head bearings, marginal wheel bearings, etc...
Blowouts and other assorted failures in a car are OK. On a bike they can be deadly. Damn I'm getting old.