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before, my gas mileage was gettin low like around 26-30. then i change my spark plugs and wires, bosch +4 plat. and autolite wires from kreagan. i notice my gas mileage gettin lower still. last tank i got 22 and this time 26. what could be the problem? clutch? alternator?

I'm actually just curious what car you've got. That's about what I'm getting as well ( i set up a little logger at http://dukes.internetmaximum.com/gas.php to track my usage)

I'm driving a '93 1.597L and just recently put in new NGK Iridium IX plugs too (didn't seem to make a difference) I'm also getting the idle problem, but not as bad since the new plugs.

I went to the Mazda dealership, and they said I need an Oil Pressure switch, a distributor O-ring and new cam and crank seals. I'm not much of a mechanic, but common sense tells me that can't help the engine's efficiency.

I paid $40CAD for a multipoint inspection, and I think it's a good deal to see what's wrong.

Do you just get any gas anywhere or always use the same company/station.

My 1.6 DOHC would get 16mpg off of race track gas yet it would do 29 in the city off of texaco. Always somthin to look at.

esso gas is pee fuel never get it

Did you change the cap & rotor when you did the wires & plugs? Those are the fastest wearing parts of the ignition system.
Get rid of the Platinums. They are made for people who dont like to get tuneups on a regular basis. They tend to decrease your milage as well. Get the NGK plugs, if you're worried about a solid spark go a step hotter.
May wanna look into an injection system cleaning, not the stuff you pour in the tank either. A real cleaning can make a load of difference.
Where you get the gas may or may not make a difference. Just a note, I tracked my milage for a couple years, & there is no noticable difference in milage between 87 octane & 92. Save your $$, just buy from a quality brand sation.