The economy of a turbocharged motor is inversly proportionalto the weight of your right foot.
At lower revs the exhaust gas is moving slower so the compressor (turbo charger) is spinning slower, making less boost, and therefore using less fuel and being more economical.
As the revs rise there is more exhaust gas flowing, spinning the compressor faster forcing more air/fuel mix into the motor.
Drive sedatley, use less fuel, put the foot down, use more fuel.
Turbocharging is a good use of an otherwise lost force (exhaust gas) and its power increases logrithmacally with the speed of the exhaust gas - more revs - more gas flow - more boost.
Where as supercharging is a direct connection to the crankshaft and actually consumes power to drive it, and can only give a set boost that is determined by the drive pulley ratio's
If I remebr correctly it was common for the 3xy roller vans to be turbo'ed sixes rather than V8's - it was a simple bolt on horse power thing.
Warren
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