From a semi-auto iShift point of view 29 mpg is a bit low even in demanding urban.
From a CVT point of view people recognise CVTs do not quite hit the same efficiency as a manual.
29 is very much in the broad range one might expect so it is unlikely there is anything wrong with the car, assuming you are topping up your lubes & fluids at service times.
True it is low wondering if the fuel consumption has improved compared to cars of the 90s as doing short journeys my mark one jazz was averaging like 32 mpg in winter these were short start stop journeys.
I had a 1.4 petrol astra 1994 with a high torque engine the fuel consumption was similar.
Driving style maintaining the car using genuine parts the correct oils does affect fuel econmy.
The most I had on my mk 1 jazz was 47 mpg on the motorway and that was 40 mph and in 5th gear.
I wanted to see how much I can get out of the car by driving like a nun.
Now I got myself a civic deisel 2.2 fuel economy better so is the acceleration
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