“Lean burn engine” means “lean burn engine” as defined in 40 CFR 60, Subpart JJJJ, as reprinted in Appendix B.

Source. (See Revision Note at chapter heading for Env-A 1300) #9803, eff 10-31-10; ss by #12584, eff 8-15-18 (formerly Env-A 1302.22)