i would have thought with after market management, and off boost driving it would be possible to achive a decent mpg,

the old mans just had his skyline remaped (with new ecu , apexi power fc) and even on a 2.6 twin turbo with bigger turbos and making nearly 500 bhp he still gets 29 mpg on the motor way,

my crapy mfi escort runing 1.5+ bar still gives at least 22 in normal driving