What model year is your i-10? If its an older model then try test driving a new model, the difference in refinement carmakers are achieving now is phenomenal.
See review of the 2014+ I-10 below:
www.honestjohn.co.uk/road-tests/hyundai/hyundai-i1.../
HJ review of Hyundai i10: "No other car this size is as quiet at motorway speeds – there's no wind noise and barely any road noise either, thanks to details like reshaped door mirror mounts and dual door sealing strips. Sound insulation from the engine is equally as impressive and again unmatched in this class, even by Volkswagen."
If you already have a 2014 onwards model, then try adding your own soundproofing to floorpan, roof and doors. Special stuff available for the firewall too. Dynamat seems the most popular.
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