I've got the
Ibiza SC with the same engine....1.0 TSI (DSG though).
The first 1k miles is not very economical, as the engine is still bedding in (still have friction etc). after 1k it seems better and smoother.
This particular engine seems to love to drink Esso 97. I get the best mpg and smoothness with this particular type of fuel. Other regular 95 grade fuel are not bad, but even though once I gave it Shell V Power 99 grade, it still wants Esso 97. I have only filled the car up with Shell, Esso, Jet, BP and Momentum 99, no supermarket standard petrol.
Official figures wise, the Arona is about 8-9 mpg down on
Ibiza with same engine.
You 'may' be able to get the below mpg figures minus 8-10 mpg realistically, once the engine has bedded in.
http://www.seatcupra.net/forums/showthread.php?t=438541
On Cruise control @ 65-70mph flatish road, I see between 48-53mpg fluctuating on the info. Perhaps you may see mid 45-48mpg on the info for Arona.
Also what petrol did you put in? Please dont say supermarket one? Perhaps give it some Esso 97 and see if anything improves? Also cold weather doesn't
help. Ideal temperature for engine is around the 12-15 degrees mark.
The difference can be about 5mpg (all things being equal on the road). Last Sun, I did 46mpg my usual Sunday drive from East to West London via central (13 miles). Few weeks before when it was 'milder' I could do about 51mpg.