You have bitten into Filo’s flawed assertion that the FairTax is flawed.
The FairTax replaces all embedded federal hidden taxes. Goods and services manufactured or produced after FairTax enactment will no longer need to carry the federal embedded taxes, therefore the cost of those goods and services will fall and the price will be brought back by imposing the NRST (the National Retail Sales tax of the FairTax legislation).
To repeat; the FairTax is a replacement tax, it is not a tax on a tax.
See Post #257 of this thread for brief comments on how existing inventories would not be subject to the NRST.
http://www.freerepublic.com/focus/f-news/1887196/posts?page=257#257
And the federal gas tax?
To repeat; the FairTax is a replacement tax, it is not a tax on a tax.
The FairTax does tax the federal gas tax.