July 1 - August 31, 2010 Retail Outlet: Petro Truck Stops Promotion: Diesel Kleen +Cetane Boost (Part No. 3080) is at a special discounted price PLUS has a mail-in rebate for $4.00 off per bottle or $30 per case. July 1 - August 31, 2010 Retail Outlet: Travel Centers of America Promotion: Diesel Kleen +Cetane Boost (Part No. 3080) is at a special discounted price PLUS has a mail-in rebate for $4.00 off per bottle or $30 per case. June 28 - August 31, 2010 Retail Outlet: Pilot Travel Centers Promotion: Clear-Diesel Fuel & Tank Cleaner, 80 ounce container, Part No. 9280. Receive $8.00 off a single bottle with mail in rebate. June 1 - July 31, 2010 Retail Outlet: Love's Country Stores Promotion: Clear-Diesel Fuel & Tank Cleaner, 80 ounce container, Part No. 9280. Receive $8.00 off a single bottle with mail in rebate. May 1 - August 31, 2010 Retail Outlet: Pilot Travel Centers Promotion: Diesel Kleen +Cetane Boost, 80 ounce container, Part No. 3080. $4.00 off per bottle, up to 6 bottles, with mail in rebate.