Hi & welcome to the forum.
I'd close the bonnet back down, throw the magnetic 'thing' in the bin & consider the job well & truly done! These are notorious not to work & actually are capable of doing more harm than good.
The simple way of ensuring your fuel economy is the best possible is to do a full mechanical service, check your tyre pressures are correct & drive slightly more carefully than normal.
Alternatively sell the 1.8 petrol & join the diesel club!!!
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No longer the proud owner of a Carens, enjoyed my time with Kia but personal circumstances forced me to sell up & return to a Skoda Octavia
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