I've got a 2003 honda civic ex coupe totally gas engine 1.7 L 5 speed i've got about $200 worth of upgrades in it, trust me its totally worth it.. I'm getting avg 44 mpg on the highway and 37 in the city, it's got a cold air intake with a ram air inductor new exhaust, came stock with 2 mufflers, now it has one straight pipe with one straight muffler, plus a small performance chip, i go within 3mph of the speed limit and when I'm coming up on a stop or going down hill i kick it into neutral. i can get between 550 and 650 miles per fill up depending on how i'm driving, i always fill up b4 the gas light comes one
replace the exhaust system, put a cold air intake with a ram air inductor and an Intake Air Temperature sensor chip, it'll cost around 200 for everything but the money you save in gas is well worth it
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