List of Figures

• Figure 1: Framework for averaging.
• Figure B-1: Calculation of equation [7] for various engine power

Figure 1 contains a flow chart to illustrate the averaging approach available to a company with a fleet composition of category A, B, C, D, E and/or F engines or vehicles.

Step 1 is to determine whether the company elects to exclude category A, B, and/or C vehicles or engines from the average. If yes, then, divide the fleet into two groups: all vehicles or engines of category A, B, and/or C; and all vehicles or engines of category D, E and/or F. If no, jump to alternative step 2.

Step 2 is to calculate the average emission value using equation 2 for all the vehicles or engines of category A, B, and/or C and for category D, E and/or F. It is not necessary to calculate the average for the category A, B, and/or C group if there are no C category vehicles or engines or for the category D, E and/or F group if it consists solely of category E vehicles or engines.

Step 3 is to determine the fleet average emission standard for category D, E and/or F vehicles or engines. Use equation 1 in the case of marine engines or look up the value in the applicable table in the case of a recreational vehicle. The average emission value, calculated in the preceding step, cannot exceed the applicable emission standard.

Step 4 is to determine the emissions credit or deficit using equation 3.

Alternative step 2: If from step 1, a company does not elect to exclude category A, B, and/or C vehicles or engines from the average, then calculate the average emissions value for the entire fleet using equation 2. It is not necessary to calculate the average if only category A, B, and/or E vehicles or engines.

Alternative step 3 is to determine the fleet average emission standard. Use equation 1 in the case of marine engines or look up the value in the applicable table in the case of a recreational vehicle. The average emission value, calculated in the preceding step, cannot exceed the applicable emission standard.

Alternative step 4 is to determine the emissions credit or deficit using equation 3.

In all cases, submit an end of model year report. If the emission credits are positive, the credits can be used to offset a future emission deficit or be transferred to another company. If the credits are negative, these must be offset at the end of the model year via accumulated emission credits or credits obtained from another company.

This is a graph of the value of “X” reported as a function of engine power for outboards and personal watercraft. X, located along the vertical axis, is derived from equation 7 and is reported in units of kilowatt hours with a scale from 0 to 40,000 kilowatt hours. Engine power is in units of kilowatts and is located along the horizontal axis with a scale from 0 to 300 kilowatts. Two sets of data points are illustrated, one for personal watercraft and one for outboard motors. The graph also contains two curves fitted to the data sets using equation 8. The curve fit for personal watercraft is y=114 multiplied by X; for outboards y=136.6 multiplied by X raised to the power 0.86 (y=136.6X^0.86)