i think just leaving your spare tyre+tools+jack at home will save more weight than puting a CFbonnet..
if you really must save fuel.. drive alone, switch off aircon and keep ~80kph. anticipate traffic and use less brakes = less acceleration.
but the TS must say.. quite poor thing always kena bullied just cos it happens to look like its bigger brother, especially those who do full wrx sti lookalike including the milo tin n decals but aiyah! look at the rear drum brakes then sianz liao.. that 1 always sure giveaway... even worse gt ppl put the fake discs at the back.
rather see a plain 'woof in sheeps clothing'... remove the fishtail spoiler and all the fancy decals.. gauges all hidden below only for driver to see... those then

don't even know what hit you..
anw the ts is a class of its own. don't know of any other 1.6l in spore with that budget that has wide body and AWD.