Regarding the window tinting i would say 35% is good enough and legal.
20% verges on too dark at night time but keeps the car very cool from experiences in other cars.
The fuel economy should drop a little more (most are around 8l/100km for petrol)
The ecu is adaptive and learns your driving style and as such will adjust fuel useage from what i heave heard.
What base/options did you go with?
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