No fallacy.

The grants for airports listed as GA can all be considered to benefit GA
only. "R" airports are also largely GA (some that I know almost
exclusively GA). Make conservative assumptions about how much of the
grants are for GA.

Then, compare to the AV gas tax generation. There is no debate, Jose. It
is fact, confirmed by Bureau of Transportation STatistics.

Why doesn't AOPA quote the acutal numbers (revenues, capital outlays, and
operating subsidies) whenever they make their ludicrous claims?
(Rhetorical question)