im running over 500hp & still get 30mpg on a run
Engine made 500.5 bhp & 408 ft/lb when it was dyno'd at Field Motorsport at 24 psi has hit( 42 psi) at times.

Current spec is : 200 block, cooper rings with six long studs, Carillo h-section rods, Cosworth forged and pocketed pistons, BD16 Inlet, BD14 Exhaust, WRC spec big port head, custom plenum and a good old T4. Running on a L8 with MSD coil pack conversion and closed loop with air to air boost control.it also has ALS&launch control