American Commercial Ethanol Fairness Act of 2008- Amends the Internal Revenue Code to expand the tax credit for alcohol used as fuel to include ethanol used in tetra ethyl ortho silicate (TEOS) production. Allows taxpayers a credit for 45 cents per gallon of alcohol which is ethanol used in the production of TEOS. Requires that the TEOS be manufactured in the United States and sold in a trade or business of the taxpayer.