Hi! i need help! i'm a newbie with nissan! I just bought my 1st ever nissan car despite the bad feedback from my relatives that it guzzles gas.
Anyway. i bought a REPO from BPI, its a January 2006 GX a/t and it's mileage is 24k.
Right after i bought it, i had the oil filter, air cleaner, oil and sparkplugs changed. I filled the gas up so i could measure the consumption, so far i'm only getting 5.8 km/l for my first full tank. by the way i used petron xtra unleaded for gas. I drove with the O/D on all the time
My daily route is Katipunan to Marcos Hiway kingsville and back. No aggressive driving and rev is only at 2000rpm. No stop and go traffic, just a bit maybe at katipunan in the morning rush.
I need help!!! i think the gas consumption of 5.8km/l is too high! what more can i do to improve the consumption?? What other things should i have checked by my mechanic?

help pls!!!