Mpg
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C63 amg esate
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I don’t know what you mean, I was just driving normally, I’ve had 5 of these and I certainly know how to drive the things, on my return journey I never exceeded 90 mph with just a few full bore throttle and for the total journey there and back it returned 35.7mpg so it did come down a bit, I can’t explain it although I did have it once before on my previous C63, all I can think of it was the fresh tank of Shell V Power 99 octane but I use that all the time so I don’t know, I must emphasise this is UK gallon not the smaller US one.
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I don’t know what you mean, I was just driving normally, I’ve had 5 of these and I certainly know how to drive the things, on my return journey I never exceeded 90 mph with just a few full bore throttle and for the total journey there and back it returned 35.7mpg so it did come down a bit, I can’t explain it although I did have it once before on my previous C63, all I can think of it was the fresh tank of Shell V Power 99 octane but I use that all the time so I don’t know, I must emphasise this is UK gallon not the smaller US one.
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C63 amg esate
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really, not sure what I am missing here. I run 17-18 daily just city driving....hammering it would lower that significantly. Best case highway is 22. But I talk about US gallons.
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C63 amg esate
UK gallon is about 20% greater in volume than US also I think octane rating is higher in the UK than US
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C63 amg esate
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Different octane rating system in the USA vs UK/Europe. 93 AKI (USA) is equivalent to 98 RON (Europe). I think the highway mpg is around 27 mpg (US). 37 mpg (UK) is about 30 mpg (US), so with a lot of highway driving and some gliding if you were in Comfort mode in the PFL it's probably possible to push that higher. Also, to really know what your mpg was and to account for errors in the board computer you should do the math based on how much fuel you actually burned for the driven distance. The board computers are known to err on the high side.
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C63 amg esate
Different octane rating system in the USA vs UK/Europe. 93 AKI (USA) is equivalent to 98 RON (Europe). I think the highway mpg is around 27 mpg (US). 37 mpg (UK) is about 30 mpg (US), so with a lot of highway driving and some gliding if you were in Comfort mode in the PFL it's probably possible to push that higher. Also, to really know what your mpg was and to account for errors in the board computer you should do the math based on how much fuel you actually burned for the driven distance. The board computers are known to err on the high side.
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In North America, depending upon the brand/station, one of the benefits of higher octane gas can be that it has zero alcohol content.
While I've never felt any difference with the common (here) 10% alcohol, I once found myself in a rural area where I could only get premium that had 20% alcohol content ... unfortunately, I didn't notice that it had that much alcohol until I was replacing the nozzle after filling the tank. Upon re-entering the highway, I immediately noticed a significant drop in power and, when I filled the tank after running out about 1/3 of it, the Road Trip app indicated over 15% drop in fuel mileage. While that was in our C43, I'd expect the same or even worse with the M177/178 engine.
I now pay more attention to the alcohol content and favor brands/stations that offer premium with zero alcohol content.
While I've never felt any difference with the common (here) 10% alcohol, I once found myself in a rural area where I could only get premium that had 20% alcohol content ... unfortunately, I didn't notice that it had that much alcohol until I was replacing the nozzle after filling the tank. Upon re-entering the highway, I immediately noticed a significant drop in power and, when I filled the tank after running out about 1/3 of it, the Road Trip app indicated over 15% drop in fuel mileage. While that was in our C43, I'd expect the same or even worse with the M177/178 engine.
I now pay more attention to the alcohol content and favor brands/stations that offer premium with zero alcohol content.
Out Of Control!!
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From: San Francisco Bay Area
2019 C63CS
In North America, depending upon the brand/station, one of the benefits of higher octane gas can be that it has zero alcohol content.
While I've never felt any difference with the common (here) 10% alcohol, I once found myself in a rural area where I could only get premium that had 20% alcohol content ... unfortunately, I didn't notice that it had that much alcohol until I was replacing the nozzle after filling the tank. Upon re-entering the highway, I immediately noticed a significant drop in power and, when I filled the tank after running out about 1/3 of it, the Road Trip app indicated over 15% drop in fuel mileage. While that was in our C43, I'd expect the same or even worse with the M177/178 engine.
I now pay more attention to the alcohol content and favor brands/stations that offer premium with zero alcohol content.
While I've never felt any difference with the common (here) 10% alcohol, I once found myself in a rural area where I could only get premium that had 20% alcohol content ... unfortunately, I didn't notice that it had that much alcohol until I was replacing the nozzle after filling the tank. Upon re-entering the highway, I immediately noticed a significant drop in power and, when I filled the tank after running out about 1/3 of it, the Road Trip app indicated over 15% drop in fuel mileage. While that was in our C43, I'd expect the same or even worse with the M177/178 engine.
I now pay more attention to the alcohol content and favor brands/stations that offer premium with zero alcohol content.
Last edited by superswiss; Sep 8, 2021 at 02:36 PM.
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C63 amg esate
Different octane rating system in the USA vs UK/Europe. 93 AKI (USA) is equivalent to 98 RON (Europe). I think the highway mpg is around 27 mpg (US). 37 mpg (UK) is about 30 mpg (US), so with a lot of highway driving and some gliding if you were in Comfort mode in the PFL it's probably possible to push that higher. Also, to really know what your mpg was and to account for errors in the board computer you should do the math based on how much fuel you actually burned for the driven distance. The board computers are known to err on the high side.
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C63 amg esate
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So, when I'm stopping to "make a fuel of myself" I try not to be "fuelish with my choices" so the car can have more energy and "fuel around" for longer ... yeah, I often try to have a gas with words, while others are just a-gassed. <sic>
