so i have a 95 civic dx stock engine with a no name CAI that i picked up used. (duh). well, i was using 85 octane here in colorado springs and did a plug, wire and oil change. i had been getting 200-204 on a tank in the city. i also put in seafoam in the intake line and the crank case. i used bg44k in the gas tank. no improvement in milage. the car is an auto and i know the auto's are shitty on milage. i moved up to 87 octane and i got 230 out of a tank. i have just put in 91 octane from sams club (seems to get the best milage with there gas) and will let you know what my end result it. any ideas as to what the stock epa milage is for this car.

 

ocatane isn't going jack for your mileage. That's all in your head.

The best thing you can do is do a tuneup, make sure the timing is correct, and keep your tires inflated correctly.

Also, drive like a grandma.