A method for diagnosing faults in a particular device within a fleet of devices is provided. The first plate and second plates define at least in part an opening through the throttle body. Modified nucleotide analogs can be attached to or coupled to or incorporated into DNA or RNA. The management computer includes a volume group overlapping use determination part and a backup policy determination part. In other embodiments, a synthetic middle distillate comprises at least two fractions: a light fraction with not more than 10% branched hydrocarbons, and a heavy fraction with at least 30% branched hydrocarbons.