Lately my FC has been decreasing on the Altis (1.6L m/t). I'm doing 8.5 to 9.5km/L in the city and around 10.5km/L mix. Used to be +1km/L better and i'm attributing this to the summer heat and the traffic on my daily route which has gone worse... which is taking its toll on my patience so i'm heavier on the gas pedal too.