2007 Honda Civic Hybrid (UK Spec model with auto start-stop function)...
Engine= 1.3L (1300cc) VTEC with IMA (Integrated Motor Assist)
Horsepower= 110 HP
Best fuel average gotten so far was 25 KPL with cruise control on, with AC on, at 45 KMH and with 4 people on-board.
13-16 KPL in city (frequent braking, full time AC; I never turn it off).
14-18 KPL on motorways (full time use of AC, cruise control never used).
16-23 KPL on long highway journeys (full time AC, cruise control is used but for a few kilometers or so, 4 people usually on-board with luggage)