Can I use my online bank statements instead of expense receipts for doing my 2006 IRS taxes?

For example, for my medical travelling necessities I do not have all my gas receipts but I can determine from my online bank statements which of the items are my gas purchases. Any good online resources for total tax dummies (idiots) that tells you what documents are acceptable and what documents are not would be [...] http://bit.ly/pDYXUY