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ensure accuracy. Based on the findings presented above, the
committee concludes that the use of commonly available
oxygenates in RFG has little impact on improving ozone air
quality. Also, use of an ethanol-containing RFG with a 1-psi-
higher RVP is likely to produce a negative air-quality impact.
This conclusion is consistent with CARB's evaluation in 1998
that led to its decision to not allow a 1-psi waiver for
ethanol-containing fuels (CARB 1998). Two important caveats
should be noted. The first relates to the fact that the analysis
presented here is based solely on data gathered from well-
maintained vehicles with properly working catalytic converters.
As noted in Chapters 4 and 6, there is substantial evidence to
suggest that high-emitting motor vehicles (perhaps because of
malfunctioning catalytic converters or faulty evapora