Your first mods sound like good ones.
Personally, I'd increase the tire pressure to at least 2.8 bar. I run my tires at 3.8 bar.
The K&N unfortunately won't do anything for you mileage wise. We've done testing here and found this to be true. Also, many here argue that they let too much through the filter. We usually recommend the regular paper/oem type filters.
The grill block is a great mod to start with. The more you can get away with the better. The gap filler is another good one. However, it is very useful to have actual instrumentation like the scangauge that can monitor coolant temperature precisely, I'd highly recommend looking into it.
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