All the coast-down measurements I've seen (only a few, BTW) showed 15% to 18%, so I think the 15% isn't far off from reality on most 911s.
Look at it this way... if the loss is higher than 15%, then you are making even more flywheel HP!!! That car must really fly.
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-- John
Slowly shopping for a 991 or 981...
'20 RAM 1500 Laramie
'19 X3
'16 Camaro RS
'00 Boxster S
'86 Carrera Coupe
'85 Jaguar XJS v12
'88 Integra RS
'74 Toyota Celica GT
'69 Camaro
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