its driving me nuts and l cant sell it for now - so only seriouspls :(

air intake system

You need to give it a good tune up, (spark plugs, wires, gas filter, air filter, oil filter) keep you tires air properly, dont speed, and drive the speed limit.

yesthere are many ways , 1 is to have tyres pumped up to correct pressure, 2 is too put some fuel efficency engine cleaner, and u can also save fuel as to the way u drive. ie steady pace with no sudden acceleration, to use the right gear for the right speed, dont rev too much and dont change to a higheer gear before u need too. hope this helps!

change the oil, air filter,fuel filter,have the front end aligned,have brakes checked in case they are sticking ,have the spark plugs cleaned or changed, and also check the fluid level in the transmission. If all this does not work take the car to advance auto and let them run a free diagnostic check on the computer to see if any sensors are bad this will severely affect fuel economy. good luck.

change the oil, filters, intake system wont save you a ton of fuel, its not even worth the money
thats why you never buy a korean car, people say hyundai and kia are getting better but they cant beat the japanese.
SELL IT CHEAP, BUY A HONDA OR TOYOTA