longer 6th gear on clio 200

is it possible to do the 6th gear longer on clio 200? mean that when going 130km/h the ratios are 3800 so do it to be somewhere near 3200 or something like that ? to have better fuel comsumption on highways
 
Surely more trouble than its worth. The 200 is hardly a mile munching motorway cruiser.
 
197 has even more short 6 gear than 200. I say it is stupid when you have to use ear protectors and clio drinks more fuel than 270bhp bmw.