Did this for many years--about one weekend a month, Enterprise used to drop the car off at my house Friday evening. I'd return it Sunday, pop my bike outta the trunk ride a few kilometres home.
Saved insurance, parking, depreciation, maintenance. Spent about $60-70/month for all the driving I needed to do.
This helped get some savings in the bank for the first time ever. And they're still there! (Only much larger).