2015 Mercedes-Benz CLA250 4Matic Update 4: Using Real MPG To Solve A Mystery

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Our Cirrus White CLA is bopping along at nearly 14,000 miles now. I’ve seen a few complaints in online forums about build-quality issues such as early squeaks and rattles. But in this car, the only sign of wear seems to be the tires; 14,000 miles seems a little early to replace them, but that’s what I’ll be doing next.

The CLA250 has been out for more than two years, and still looks good anywhere.

I’ll definitely look for tires that could help mileage a bit because there has been no improvement in the CLA’s sub-22 mpg overall number. That’s significantly below the EPA estimate of 27 mpg combined and our Real MPG test number of 26.1 mpg combined.

In Update 3, I went over possible reasons for that, having ruled out any mechanical trouble via a visit to the dealership.

Now’s a good time to point out a nifty tool we have via our Real MPG program. If you go to our Real MPG page and select your car, you can find a good estimation of what your real-world mileage would be under your driving conditions. You can use the estimator tool to select your driving situation (all city to all highway), normal traffic level, driving style, and the frequency of running your air conditioner.

Employing a worst case scenario, I was able to get the Real MPG combined estimate down to 22.6. That’s within sight of what I’ve been seeing, so maybe for L.A. life our mpg number isn’t a sign that something is wrong. I still have a backup test method to try: That’s temporarily swapping long-termers with another Motor Trend editor who has roughly the same driving conditions. It wouldn’t be a perfect comparison, but if that person comes back with mileage near 27 or 28, then it might mean I need lead-foot awareness classes or something.

Among the cheers and jeers I’ve noticed:

The cruise controls are nifty. There are two positions when you’re increasing or decreasing the set speed. Push to the first notch to set speed in 1 mph increments. Click through that to the second position to work with 10 mph increments. Handy and precise.

Though it looks soft and luxurious, the hatch on the center console storage area slams with an ear-piercing noise if not closed carefully.Though the CLA250 does a good job of providing a luxurious-looking interior, it falls short in two places: Both the hatch over the center console storage and the glove box feel light and cheap. If you accidentally slam the center console hatch down, it closes with a sharp and loud plastic-meeting-plastic noise. A gasket or a soft-close mechanism wouldn’t hurt. The shiny black rims are gorgeous, but brake dust and road grime quickly dull their look. They’re easier to clean than many, though.

The smart-looking rims on the CLA250 lose their shine quickly, but look awesome after a wash or wipedown.

More on our long-term 2015 Mercedes-Benz CLA250 4Matic:

Arrival Update 1: In Search of the Goldilocks Transmission Setting Update 2: Reconsidering Auto Stop and COMAND’s Usefulness Update 3: Normal Noises, and Real-World Mileage