The consumer price index, which determines that cost of living adjustment, is too generous, according to a study commissioned by the Senate Finance Committee.
The allowed deduction is for the business-use percentage of the lease price plus regular expenses (gas and so on) minus a small adjustment (the lease inclusion amount) that is smaller this year than in the past.
He wants to tie the adjustment to what's called the Chained Consumer Price Index, which many believe is a truer reflection of how we spend money during economic swings.