Join Date: Jul 2019
Car Year & Model: GLA 250 4matic
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If you have 5 mile trips 18 is about right as the ECU runs rich to heat up the cats.
50 mile trips should net you mid 20s.
500 miles trips will get you around 30.
Tire pressure can make a big difference as well as keeping the car in good tune. Low pressure in tires creates more flex with each revolution and requires more energy to move the car.
Feel your brake discs after a freeway runwith a coast to stop after some miles of you have an uphill off ramp. If they are hot your pads may be dragging.
Keep in touch with anything you find.
Welcome to the GLA forum. What kind of driving do you do? That kind of MPG is not unheard of in frequent gridlock-like commuter traffic. The 4WD versions do have slightly lower gas mileage than the 2WD models. When my Eco Start/Stop is working regularly (it is finicky) I've noticed perhaps 1-2 MPG better performance. And just to verify, you are running high octane fuel, correct? Do you have access to previous maintenance records to know if the required scheduled maintenance was accomplished? 2016 models are coming up on the second Schedule B service which IIRC includes new plugs and other tune-up-like work. Depending on your mileage you might already be there. What tires are installed, OEM Continental runflat tires? Just a few things to consider, hopefully other members will add some thoughts.