Working from home vs communting

I quit driving in October. I haven't watched what I spend at all in that time. I've been eating out more, eating more in general as I bicycle everywhere, buying quality sticks, etc. yet somehow I have amassed over 7 grand extra (above what I usually put aside) in that time. Driving is expensive as heck! I'm in agreement with hotreds though, don't forget to factor in benefits suchh as medical insurance, 401k matches which add up quickly, etc.