Do a search on TOTV for 'bond interest deductible'. You can read through prior threads on the topic to your heart's content.
Is the bond interest a legitimate deduction? No, IMHO. If you feel comfortable claiming it as a deduction on your taxes, that's certain each individual's prerogative.
I looked into this soon after we purchased our TOTV house and feel comfortable that the info provided by the IRS on the topic is pretty straightforward. Same info as referenced in jimbo's post.
Bill