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the catch is that in second gear your probably turning 2-3 times as many revolution to produce 1 mile of distance compared to 5th. Loading the engine in 5th gear at the same RPM and Load would simulate the fuel consumption with 2 or 3 times the mileage. Sadly the reality is a standard ICE will never see 72-105 MPG in boost, so logically it is an error.
In addition, lower loads require less air, less air will require less fuel at a givin a/f ratio. I require 5-10 times more fuel in boost than at lite cruse.You may burn fuel most effiently at x rpm and x load but that doesn't mean your using less. An engine will always require less fuel with a lighter load at the same RPM (99.999% of the time, there may be ignition issues to consider but a correctly tuned ignition follows this rule. Sorry if this is hard to follow Im not the best at explaining, but I have been tuning a turbo engine for a year now.
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