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Think about it this way:
At full boost my 550cc injectors were running about 75% duty cycle. So lets calculate for 50% duty cycle, to account for on/off/part throttle.
225cc x 4 = 900cc/min = .9 liters/min = 0.238 gallons/min
Figure an average speed of 60 mph to make it easy, so 0.238 gallons/mile
1/0.238 = 4.20 miles per gallon
Of course you will be doing a little better than that, but running around at WOT all the time is certainly not good for economy.
At full boost my 550cc injectors were running about 75% duty cycle. So lets calculate for 50% duty cycle, to account for on/off/part throttle.
225cc x 4 = 900cc/min = .9 liters/min = 0.238 gallons/min
Figure an average speed of 60 mph to make it easy, so 0.238 gallons/mile
1/0.238 = 4.20 miles per gallon
Of course you will be doing a little better than that, but running around at WOT all the time is certainly not good for economy.