A number of alternative fuel amendments could come up for a vote tomorrow in the Senate as part of the highway bill now being debated. This includes an extension of the biodiesel blender's credit and the New Alternative Transportation to Give Americans Solutions (NAT GAS) Act.  An agreement was made last week to allow 30 amendments from a list of more than 300 to the bill.NAT GAS Act: Senate Majority Leader Harry Reid (D-Nevada) has allowed the NAT GAS Act to be an amendment to the highway bill, which is likely to be voted on tomorrow in the Senate. The plan, which would provide tax credits for natural gas burning vehicles, is championed by T. Boone Pickens. The legislation would offer a tax credit covering as much as 80 percent of t...