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FWD cars can achieve maybe 12% or less in drive line losses.
I think 15% or a bit higher is pretty accurate for RWD.
AWD- forget it...you are talking 22-29%. That's why every AWD car suffers significantly in top speed and fuel economy versus similarly geared, weighted, and powered RWD cars.
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2006 BMW M5 Sedan
SMG III
Silverstone Metallic/Black Perforated Merino/Aluminum,
X2/4MA/610/322/453/655/416/465/261/496
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