The test fuel matrix provided in the regulations delineates the minimum test program that would be acceptable to the Agency for Complex Model augmentation. A more comprehensive test program, which would provide the full set of orthogonal matrices which is statistically necessary, is allowed and is encouraged. The Agency expects that primary interactive effects can be adequately identified with the required minimum test fuel matrix.(7/1/94)

This question and answer is posted at http://www.epa.gov/otaq/regs/fuels/rfg/qa/420r03009.pdf. The original was posted in the Q&A posted on 7/1/94 which can found at http://www.epa.gov/otaq/rfg_qa.htm" See Question ID 3857 for RFG (Taken from the first question on http://www.epa.gov/otaq/regs/fuels/rfg/qa/420r03009.pdf)

## Clarify that interactive effects must be investigated when augmenting the Complex Model for a new fuel parameter despite the fact that the specified test fuel matrix does not include the full set of orthogonal matrices which is statistically necessary.

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