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I think what you feel is engine breaking. In auto mode the transmission is gearing down to be ready in case you want to speed up again.
You can test this by coasting in M8 vs auto.
This car does not coast well. This is partly why fuel consumption kind of sucks in auto.
PS. I get at least 4 mpg more if I drive in manual mode. I drove a whole tank in manual mode to compare.
Last edited by Njerts; 07-02-2014 at 08:54 PM..
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