They are using cheap 10 rs wali gauges. My E2 2013 temp gauge never goes towards middle mark, rather it remains close to C at the start of green area even with AC, rises a bit if driven in rush, congestion with or without ac, but it never reduces the water in the reservoir bottle.
Secondly the fuel gauge is also faulty, sometime it takes time coming to rest at E when you switch off engine. It falls fast from F towards E after fill up, but drives more near E, but I always dread running out of fuel so I fill it up when it comes close to E.
Poor gauges quality, fitting to blame.