Altoona based Sheetz is slashing its gas prices to help travelers during the Thanksgiving holiday. The convenience store and gas station chain says its unleaded 88 gas will be 40-cents off per gallon through November 30th. Unleaded 88 gas has been approved for all vehicles made in 2001 and later. Most, but not all Sheetz locations offer unleaded 88, so those looking for the savings are urged to double check their nearest location to see if unleaded 88 is offered, before heading to the pumps.