[Code of Federal Regulations] [Title 40, Volume 16] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR80.51] [Page 663] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 80_REGULATION OF FUELS AND FUEL ADDITIVES--Table of Contents Subpart D_Reformulated Gasoline Sec. 80.51 Vehicle test procedures. The test sequence applicable when augmenting the emission models through vehicle testing is as follows: (a) Prepare vehicles per Sec. 80.50. (b) Initial preconditioning per Sec. 80.52(a)(1). Vehicles shall be refueled randomly with the fuels required in Sec. 80.49 when testing to augment the complex emission model. (c) Exhaust emissions tests, dynamometer procedure per 40 CFR 86.137-90 with: (1) Exhaust Benzene and 1,3-Butadiene emissions measured per Sec. 80.55; and (2) Formaldehyde and Acetelaldehyde emissions measured per Sec. 80.56.