Interesting..
The handbook suggests..
"Normal mode - Provides an optimal balance of fuel economy, quietness, and dynamic performance. Suitable for city driving"
"Eco drive mode - Helps the driver accelerate in an eco-friendly manner and improve fuel
economy through moderate throttle characteristics and by controlling the operation
of the air conditioning system (heating/cooling)."
"Sport mode - Controls the hybrid system to provide quick, powerful acceleration. This mode also changes the steering feel, making it
suitable for when agile driving response is desired, such as when driving on roads with many curves."
One generally doesn't need quick, powerful acceleration on the motorway, usually smooth constant speeds, with very shallow corners.
Are these fuel economy figures from the OBC (after a reset mid journey) or calculated from brim-to-brim refuels?