I'd go the 3.7.
If fuel economy was the main factor, you wouldn't have bought the XR8!!!
If you went with the 3.45, you would always wonder how would the 3.7's go.
Two things: 1) 3.9 ratio gears are not available in M86.
2)Off the line, a BA V8 5 speed manual with 3.9 would be the same as an AU XR8 T5 with 4.46 diff gears.
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