An interesting article about Insight tuning at:
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On my fairly demanding open-road test section, the Honda without its hybrid system working produced a fuel economy of about 4.2 litres/100km; that compared with about 3.8 litres/100km it achieved over the same stretch as a working hybrid.
With the new retune, the car achieved over this stretch of road the same fuel economy it did as a working hybrid – 3.8 litres/100km! Wow – no hybrid capability and the same fuel economy!
So was the tuned car always as economical as it was when a working hybrid?
No.
In city cruise conditions it used to achieve fuel economy as low as 2.8 litres/100km – and after the retune the best it could do in those conditions was about 3.8. (Incidentally, what clearly killed the fuel consumption in non-hybrid form was accelerating up to speed. In those conditions the missing electric assist gave the engine great thirst.)
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This is the 3d part of a series about tweaking fuel-air ratios.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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