SG can get sketchy on fuel consumption but can be adjusted and calibrated to compensate for the discrepancies. It's better than nothing and with it, helped refine my techniques to improve FE.
Have you addressed all the areas that can affect FE? Aero isn't the only thing you could do (plus if you're doing lots of short trips they might not matter much either). Hit the other 4 areas in my sig and it might help.
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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