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      03-16-2018, 02:57 PM   #1
frankchn
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Car and Driver: M5 vs E63S vs CTS-V vs Panamera Turbo

I think the article is only available in the printed magazine at the moment, but the final rankings are:

1. BMW M5
2. Mercedes E63S
3. Cadillac CTS-V
4. Porsche Panamera Turbo

The M5 is first or tied first in all the acceleration and braking tests except the top gear 30-50 mph, where it lost to the CTS-V (the supercharger in the CTS probably helped). It was also the most economical in their 400-mile trip (15 mpg vs the 11 of the CTS-V and 13 for the other two).

They liked the M5's chassis balance and feel ("playful chassis back in balance with a more potent engine", "dives into corners with precision and deftness", "the new one drives more like a grown-up M3") better than the E63S ("fickle chassis balance that succumbs to understeer and oversteer", "on tightly wound mountain roads, the AMG's frontend grip washes out early, and the heavy steering makes the E63 feel more ponderous than it is").

All in all, I'd say it is a good showing for the new car.
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      03-16-2018, 03:24 PM   #2
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the numbers.... weird that all the cars are on 93 octane except the E63S:

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      03-16-2018, 04:06 PM   #3
frankchn
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Quote:
Originally Posted by Vic55 View Post
the numbers.... weird that all the cars are on 93 octane except the E63S
I think that is just the recommended octane rating for all the cars. I guess Mercedes had the California consumer in mind when it designed their new 4.0L V8
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      03-16-2018, 04:13 PM   #4
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Quote:
Originally Posted by frankchn View Post
I think the article is only available in the printed magazine at the moment, but the final rankings are:

1. BMW M5
2. Mercedes E63S
3. Cadillac CTS-V
4. Porsche Panamera Turbo
I just read it on my iPad...so it is available electronically as well. Nice showing indeed.
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      03-18-2018, 09:08 PM   #5
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Quote:
Originally Posted by frankchn View Post
I think that is just the recommended octane rating for all the cars. I guess Mercedes had the California consumer in mind when it designed their new 4.0L V8
The octane issue, if true, could be significant. I will read the article shortly. However, if each car was tested based on its approved min. octane, then in a state such as CA where we only have 91 as premium (not counting rare and expensive 100), the BMW, Porsche and Cadillac may be down on power compared to the E63s. Further, adding 93 to a car tuned for 91 does not typically add power. Since the few advantages the M5 has from the chart above over the E63s are razor thin, the 91 v. 93 issue might make a meaningful difference. Of course, all of these cars are fast for their categories.

I am in the market for either a M5 or an E63s so these are interesting times!
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      03-18-2018, 09:51 PM   #6
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Quote:
Originally Posted by Stealth7 View Post
The octane issue, if true, could be significant. I will read the article shortly. However, if each car was tested based on its approved min. octane, then in a state such as CA where we only have 91 as premium (not counting rare and expensive 100), the BMW, Porsche and Cadillac may be down on power compared to the E63s. Further, adding 93 to a car tuned for 91 does not typically add power. Since the few advantages the M5 has from the chart above over the E63s are razor thin, the 91 v. 93 issue might make a meaningful difference. Of course, all of these cars are fast for their categories.

I am in the market for either a M5 or an E63s so these are interesting times!
I think for day-to-day it probably won't make that big of a difference, and there is always the possibility of blending 91 and 100 octane race gas in a 4:1 ratio to get 93 if you are going to a track day.
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      04-08-2018, 03:38 PM   #7
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Quote:
Originally Posted by Stealth7 View Post
The octane issue, if true, could be significant. I will read the article shortly. However, if each car was tested based on its approved min. octane, then in a state such as CA where we only have 91 as premium (not counting rare and expensive 100), the BMW, Porsche and Cadillac may be down on power compared to the E63s. Further, adding 93 to a car tuned for 91 does not typically add power. Since the few advantages the M5 has from the chart above over the E63s are razor thin, the 91 v. 93 issue might make a meaningful difference. Of course, all of these cars are fast for their categories.

I am in the market for either a M5 or an E63s so these are interesting times!
Two well-built cars. Tough choice. I think the E63S checks more boxes for me, but I've always been a loyal M guy.
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