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You need a visit to the garage, could be several things. Rough running could be fuelling, injector(s), egr issues. Mpg could involve the above issues and/or could be coolant temperature related, main or egr thermostats are typical culprits.
Do you suspect the whine is clutch/gearbox related? If it is engine related it will be there 'changing' with engine revs, clutch in or out of engagement.
HighlandPete
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