For info how economical is your Rio? I had a 2016 i20 2.1 D. 1st 28 months AVG 62 mpg. All this time something was amiss. Eventually by default (an ex Peugeot technician arrived at the Hyundai dealership) it was sorted - too much/often diesel was "cleaning" the catalyser.
The last 18 months AVG...
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