Shitty gas milage

I have a 92 b2600i....I just did a tune up, plugs, wires, distributor cap, rotor, airfilter, pcv valve, fuel filter, 92 octane.......what else is there to change or do to where i can get better gas milage......im using alomst a half tank of gas to work and i only drive 15 miles a day...i have to put gas in every other day......

i would check your egr valve and your cat converter. if you can i would get rid of both of them.

DRIVE THE SPEED LIMIT

Not sure about mazdas, but like was said, check your egr, cat, and o2

how's it doing power wise? do you feel any decrease in power? also when you get on it if the cat is clogged it'll make a nasal sounding humm. also check your fuel pressure, like the man above me said i'm not big into mazda's but if your fuel pressure regulator is bad it may be pumping more gas in there than is needed.

vacuum leak, stuck injector, bad fuel pressure regulator. Idle the engine and pull off the plug wires one by one. See if you have a dead cylinder, the idle wont change when you unplug the dead one.

Also, you O2 sensor may be bad, unplugging it will force the ECU to stay in open loop and may improve gas mileage.

And how is the idle? Make sure you got the plug wires on correctly. I dont remember the firing order on a 2.6 but it should be 1342 like other mazda 4 cylinders.

Make sure you didnt knock a big vacuum line off.

The B2600i uses a flapper door AFM (Air Flow Meter, that silver box behind the air filter), make sure it isnt unplugged, or the flap stuck open. The flapper door outputs a resistance to the ECU to tell it how much air the engine is ingesting, and if it is stuck open or unplugged you will use a LOT more gas.

and 92 octane will do nothing for an engine without dynamic timing and a knock sensor. (the B2600i has neither) Buy the cheapest stuff that doesnt knock, you'll get more power and more mileage.

AMEN MAZDA LORD RUSS-D

holy shit half a tank a day!! I use about a tank a week driving about 40 miles a day

also you didn't ditch all that stuff on the pass. side fender that connects to the carb? that will make the truck run rich and get crappy gas mileage

that stuff is on the B2000 and B2200 but not the B2600i as it's injected (no carburetor, completely different system)