Fathur

So i have a problem with my 2005 c240 elegance, first problem was the Fuel cons it get around 16,8l/100km or 14,7mpg are those number normal or not(my usual road is kinda Busy Road). Next is about engine vibration, when idle you can feel the engine running and when driving the car the engine kinda vibrate a lot at certain rpm range from 1k thru 2k after that the vibration gone any idea what was that thank you all
(new tO the car scene)