Just going to throw some actual highway mileage data out there.
Mileage from San Francisco to Reno, NV (mostly uphill!) - 29.3 mpg @ 71 mph average
Mileage from Reno, NV to Wendover, NV/UT (lots of mountain passes, high altitude 6000-7000 ft) - 27.6 mpg @ 76 mph average.
Measured at the pump.
Not too shabby for a 332 bhp sports car! And well above the EPA estimated fuel econ.
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'10 PW 370Z 7AT - wife's car - Project Raspberry Cheesecake
'08 Evo X - built motor+trans | BB-X @ 32 psi | CH3OH | self-built+tuned - ??? WHP
'01 Galant V6 - built motor | GT35R | self-built+tuned - 550+ WHP (retired) |