SL/R232: Fuel Consumption
Thread Starter
Senior Member
Joined: Feb 2014
Posts: 339
Likes: 205
From: Miami/Washington DC
2022 AMG SL63, 2015 Ferrari 458 Spyder, 2021 ALPINA B7
Fuel Consumption
I am trying to figure out if my car is odd or if it is me.
I get about 9 mpg in town and best case scenario about 18 mpg on the highway - these are much worse than any of the tests and I can't figure out what I am doing wrong.
What kind of consumption do y'all get and what tips can you share?!?
I get about 9 mpg in town and best case scenario about 18 mpg on the highway - these are much worse than any of the tests and I can't figure out what I am doing wrong.
What kind of consumption do y'all get and what tips can you share?!?
Out Of Control!!
Joined: Nov 2018
Posts: 11,429
Likes: 5,336
From: San Francisco Bay Area
2019 C63CS
Can't specifically tell you, but ballpark this sounds about right. The official numbers are 14 mpg city and 21 mpg highway. You are not gonna get those, unless you drive like a grandma. Getting within 2-3 mpg of the rated highway mpg is about what to expect in the real world. Your city mpg also doesn't surprise me. With lots of stopping and accelerating, that's pretty much what you are looking at. The test cycles have lots of idle time where start/stop makes manufacturers look good, but if you are not regularly stopped 7+ seconds with the engine off, you are not going to see much benefit of ECO start/stop. For comparison, my C63S coupe with the 9 MCT is supposed to get 17 city and 26 highway. On a long highway cruise with DISTRONIC I get around 23.5, so about 2-3 lower than rated like you and city I see as low as 11, so up to 6 mpg below rated (I turn off ECO start/stop). Just depends on how heavy my leadfoot is that day. These cars are about smiles per gallon, not miles per gallon 
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Last edited by superswiss; Oct 21, 2022 at 03:01 PM.
Super Moderator
Joined: May 2002
Posts: 10,542
Likes: 3,674
From: Land of 10,000 lakes
AMG GTC Roadster, E63s Ed.1, M8 Comp. Coupe
Never bothered to calculate MPG. I know that the M177/178 engines are thirsty in daily traffic. Our GTC goes between 200 - 230 miles a tank, which was similar to the E63s. The M8 maybe gets 280-300 miles, so definitely lower in its consumption.
Out Of Control!!
Joined: Nov 2018
Posts: 11,429
Likes: 5,336
From: San Francisco Bay Area
2019 C63CS
+1...never bothered to calculate it. Just occasionally check what the Mercedes me connect app says about the most recent trip out of curiosity. Just for further reference, took the C63 on an errand with mixed highway and city driving just now. App says 17.5 miles, average speed 23 mph and average mpg 12.8 mpg. I just noticed that my lifetime trip data got reset, probably during the last service where they updated the engine software, but from what I remember my average over the last ~30k miles was about 15.8 mpg. The SL is heavy and the aerodynamics are somewhat poor due to the ragtop, especially if open.
Last edited by superswiss; Oct 21, 2022 at 06:33 PM.
