Chart is not that informative. In 2006 it says that the average taxable income is $4,500 for 3. above. That’s a $450 tax bill from the 2006 tax tables. The oil company taxes should just be added on a pro rata basis to the $450. If the oil company taxes were zero the $450 bill may not change, gas is just cheaper creating opportunity for the driver to invest or spend, happily raising federal revenue elsewhere while also creating jobs.