Hi,
My Nissan Sunny B15 burns too much fuel. What can cause this problem?
Thanks
Ron

Make sure electrical system is in great shape; i.e. replace spark plugs, rotor, distributor cap, spark plug wires, oxygen sensor, and check idle rpm and engine timing. Also, replace air and fuel filters, check tire pressure regularly (34 psi), and add fuel injector cleaner twice a year. Finally, use full synthetic engine oil and transmission fluid.