Frugal Challenge: Gas Challenge

Gas prices, as everyone knows, are going way up these days.  Since it was 66 degrees in Lil' Rhody today, and daylight savings time either begins or ends this Sunday (we spring forward, I just don't know if that's standard or DST), which means that my bike/walk home from work will be better lit, I have decided to issue myself a little challenge.

I filled up my gas tank on Monday for $38, and that was even with $.20 off per gallon because of grocery points.  Now my plan is to see exactly how long I can make that tank of gas last.

If I'm just going from home to work and back, I will walk or ride my bike--no driving allowed!

Thursdays, I'm filling at my old job while my boss is out on maternity leave, so I will have to drive, because it's 20 minutes away.

I'm going to be extra vigilant about clustering errands to avoid extra trips to the grocery store and other places, plus, I should really just avoid most stores these days since I've still car that stupid car bill to pay off.

I do have some meetings and a doctor's appointment coming up, so that's a factor.

I've asked bf to replace the gas that he used to go to his mom's house the other day.

It's a 13-gallon tank, and when I was commuting six-seven days a week, I usually had to fill up every week or ten days. Anyone want to take any bets as to how long I can get by on a single tank?  My goal is to make it to April, but that might be very wishful thinking.