How to save money?

I'm having trouble saving money.
Are you really? How often do you eat fast food, do you ever check the cost of your actions? Do you drive to work even though it's a mile or two away?

Do you have a Costco/Sams Club membership? Do you look at the price per unit of the food you buy?

http://abclocal.go.com/kabc/feature?id=6702155

http://www.mrmoneymustache.com/2011/09/30/is-a-costco-membership-worth-the-cost/

Why should I save money?
The 4% rule of safe withdrawal rate is reasonably well tested, which implies that you have 25x your yearly expenses saved up, you can live on that for... well, a very very long time.

Also, living paycheck to paycheck sucks. It's stressfull and in all likelyhood unnecessary. You should have at least 1-6 months of savings to cover eventualities, like being fired

or a car breaking down, or getting injured. It's called an emergency fund, and it's one of the most important basic steps in finance you should take.

http://www.getrichslowly.org/blog/2006/09/08/how-to-start-an-emergency-fund/

http://www.mrmoneymustache.com/2012/01/13/the-shockingly-simple-math-behind-early-retirement/

http://www.firecalc.com/