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My Volvo's XC60 2010, t6, fuel efficiency in city suddenly decreased it now consumes 2-3 liters more than it used to be. However on highway the consumtion stayed the same. Had it checked with computer diagnostics and nothing appered to be wrong. I was told that it could be a thermostat (which still works but not doing its job as it used to be). Has anybody had the similar issue and what could be the reason?

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