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I've had my ATS since October and while the initial gas mileage was below the EPA rating - 18 vs 22 MPG city. Freeway driving also low - 23 MPG. Not at all pleased.

And now the economy is dropping even more. I only got 16.2 on the last tank (mostly city driving)

Also, noticed when stopped when in gear the engine seems to shudder and seems to miss.

I'm taking it in to see if the dealer can find anything, but wanted to see if anyone on this board has had economy problems and how it was fixed.

Thanks
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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EPA "gas mileage" estimates are wildly optimistic. Absent any mechanical or calibration problems we are ALL fortunate to get anywhere near their projections............ and, as always, fuel mileage depends on current driving conditions, weather, tire pressures, driver experience, and time lapse between fuel fills and usage calculations.

If you drive the car for a half hour interstate at 25 mpg and a half hour in heavy stop&go traffic at <5 mpg your average mileage will be about 14 mpg for that hour.

If I take my 4.6 STS into DC and putt-putt around in the city my fuel mileage is plain, flat horrible. But it gets 25 mpg open highway and 19 rural.
 

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2014 ATS
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I've had my ATS since October and while the initial gas mileage was below the EPA rating - 18 vs 22 MPG city. Freeway driving also low - 23 MPG. Not at all pleased.

And now the economy is dropping even more. I only got 16.2 on the last tank (mostly city driving)

Also, noticed when stopped when in gear the engine seems to shudder and seems to miss.

I'm taking it in to see if the dealer can find anything, but wanted to see if anyone on this board has had economy problems and how it was fixed.

Thanks
Hi! I'm in some what in the same boat you are. I have the same car . remember if you also have run flats tires that doesn't help.I ask the dealer once the same question, they told me to buy a fuel cleaner , that maybe it will help.see what the dealer tell you.keep us informed. Thanks
 

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2004 CTS Lux Sport and 2014 ATS 2.0T AWD Lux
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For the most part, EPA ratings are based on a laboratory reading. Not too much fun if you stay in a lab treadmill all day.

Real world mileage in NJ: 15% off from city and hway ratings.

However, I have gotten 10% over EPA if I fill up on a highway, drive a constant 50 mph until the next fill-up, again on a highway gas station. Not real conditions for everyday driving.
 

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2019 Mercedes E450 Cabriolet, previous 2013 ATS 2.0T AWD, 1973 Corvette 454
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I gotta tell ya. I have the 2.0T with an automatic and get better mileage. I range from averages of 24mpg to 28 depending on my foot and speed.....and in the 30's on long trips. I think you have cause for concern on your fuel mileage with a 2.5 and manual.
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Puckman said:
I've had my ATS since October and while the initial gas mileage was below the EPA rating - 18 vs 22 MPG city. Freeway driving also low - 23 MPG. Not at all pleased. And now the economy is dropping even more. I only got 16.2 on the last tank (mostly city driving) Also, noticed when stopped when in gear the engine seems to shudder and seems to miss. I'm taking it in to see if the dealer can find anything, but wanted to see if anyone on this board has had economy problems and how it was fixed. Thanks
That's not good. I have a 2013 2.5 w/auto. City mileage is low 20's, but highway is consistently between 32 and 34. I've had as high as 36. I believe EPA rating was 33.

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That's not acceptable. I have a 2013 2.5 Auto and get low 20's in city and consistently 32 - 34 on highway. Highest recorded on a 150 mile highway trip was 37. EPA highway rating was 33.
 

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2014 ATS 3.6 Premium RWD, 2016 Corvette Z06, 2018 GMC Sierra Denali 2500HD Diesel
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Sounds low but mileage is highly dependent upon driving conditions and individual drivers. City driving in heavy stop and go traffic kills mileage for that tank as does any extended idling.

My ATS (3.6L RWD) is at 26.4 average but my commute is near perfect for obtaining high MPG. It is just under 60 miles total and 45 of that is on 2 lane rural roads with no traffic although it is planting season so there is a lot of agricultural traffic and I hit 95 MPH several times yesterday to get around ag traffic in passing areas. I changed my in-town route last year adding about a mile to get to my office but avoiding 7 new traffic lights that have been added in the last year several of which have annoyingly long change cycles.

Find a level interstate in your area and see what the instant mileage monitor reports holding a steady 70 on a non-windy day. Try a different gas station for a few tanks to see if that changes things
 

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2004 CTS Lux Sport and 2014 ATS 2.0T AWD Lux
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Yes, traffic lights and left turns are also mileage killers. Even though I have a 32 mile commute at highway speeds, there are 5 traffic lights at each end on the local streets. Missing a light means 30 seconds at 0 mpg. Then there's acceleration and deceleration, other gas killers. Missing a few lights means about an extra 10 minutes of 0 mpg. That really drops the average mpg.
 

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2015 ATS Premium 3.6 Coupe RWD built 12/2014
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My 2015 ATS 3.6 RWD Coupe is getting 24.2 with combination 60hwy/40city driving. Car has 1800 miles so I have not been over 4000 rpm. Drive 10 miles each way per day, speed limit is 50 and there are 8 stop
lights or signs. Noticed .2 better gas milage this past week as more miles get on the car.
 
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