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If it was (2), then, thinking about it further... If an engine is on low load, then it can actually run lean, without detonating, and will only begin running unevenly once it becomes very lean (maybe > 16:1), and, modified turbo cars on full boost can go to 8:1 (and run fine)... So, if there were large differences in the air-fuel ratio, then you still might not notice.
The Scanguage gets its data direct from the ECU, so, it might be that (2) is indeed the case - and that, keeping the MPG figures on the better of the two options might be very good for the economy.
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Team GasMisers5 - #1 for first three rounds of the original GS Fuel Economy Challenge
Miles displaced by e-bike since 1 Jan 2008: 62.6 ( 0 kWh used)
Hypomiler 
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smartzuuk 
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