4.B: Hawaii

In contrast to Alaska, Hawaii has incorporated ASTM D4814 into its statewide fuel quality regulations. In terms of volatility controls, the state imposes ASTM D4814’s C-3 class year-round, with no differentiated values between summer and winter. Fig. 1 depicts the specific limits associated with this volatility class.

State regulations do require that volatility limits for ethanol blends meet those of ASTM D4814, meaning there is, effectively, no 1-psi (6.9 kPa) waiver in the state. As we saw earlier, the CAA exempts Hawaii from RVP limits to begin with.

Hawaii implemented an E10 mandate in 2006, but then repealed it 2015. Nevertheless, the EIA data suggests that, even without the state-level mandate in place, RFS requirements are spurring blenders to widely market E10 blends in