I used to do something similar... I would always round up the deductions from my account (I.E. I paid 2.46 at the store and I would record it as 3.00).  Then when it came time to reconsile my account on payday, I would then take the difference and immediately transfer it into my savings account.  True it may have only been a couple of dollars, but when you do that twice a month it adds up eventually.

I'm like vivasuzi though I cannot trick myself with $$ since I use my online account statement to know how much I have.  Right now we are at the point where every penny is counting toward something. But eventually I want to get back to the point where small amounts are going straight into a savings account.