As above, i'd leave the rear spoiler in place personally.
Wheels - get the
lightest you can afford. On my civic i have some rays (forged) wheels that are significantly lighter than the factory heavy cast rims. Bought them used so not that expensive.
If you're swapping wheels, then consider also getting l
ow rolling resistance tyres. My pirelli p7 "blue" are A rated for roll = less fuel used.
Also, as above, pump them up - you can go a bit higher than the factory recommended levels (stay within the tyre limits though) ride suffers a little, but economy goes up.
For some reason Toyota marketing folks think that folks all want a high riding 4x4 looking vehicle, so the CHR like many other sits really high. check out if you can get some
lowering springs (eibach?) to reduce ride height - this not only helps your mpg but also looks cool
Other than that ^ your driving style will be biggest impact on fuel economy - lots of good eco driving tip on the wiki in this forum.
Quote:
Originally Posted by Kamikazi
Do you think is gonna help the mileage of the car and economy?
But big influence not just 0.1L/100KM?
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To give you an idea, with the light wheels, lowered ride height and low rolling resistance tyres added to my civic i saw about 5-10% improvement in MPG. If there were any easy things to do that gave you a big improvement then toyota would have done them already
biggest impact you can make is your driving style.