I believe low 20s MPG
Also the thing with a supercharger is the power is constant whereas a turbo kicks in at say 3000rpm
So makes it much easier to drive as you still have low down torque whereas you don't with a turbo
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407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold