It seems getting debt under control will provide more of a boost to your cash flow than any expense tweaking.
At first glance though, these are my thoughts:
-Slow down on the 0% loans if you can, you need to pay either the minimum payment or, if the 0% is not for an indefinite period, the amount such that when the 0% period ends, the debts are paid off.
- What payment program are on with the student loan? Can you get those lower? Can you refi with, say, SoFi to lower the interest?
- Keep that emergency fund! Add to it regularly until you get to the amount you are comfortable with.
-Make sure you are getting reimbursements from your employer for the insurance and gas. If you aren't claim them come tax time. Then take that mini-windfall and throw it at debt or the emergency fund. If you are entitled to per diem, claim that or get reimbursements from your employer.
-Last, go job hunting. At your income, you don't have tons of wiggle room.
-oh, also keep up with the 401k contributions!