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Engine mods
I had a '97 S-10 Reg. cab, stepside 4cyl. 5 spd. I was getting 30 mpg with only these things: K&N cold air intake, Jet module chip (stage 1), cat-back exhaust, lowered 2" all around (the "extreme" suspension), and new side mirrors from Stylin' concepts (the other ones came with the truck broke). I miss my S-10.
I'd skip the catback exhaust. It got annoying after awhile. Besides, go with a header and you usually get more torque... Pace Setter makes headers for the 4 cyl S-10. I've found them cheapest at Jegs.com.
If you want to continue with engine mods I've heard advancing the cam timing (cam timing not ignition timing) gets you more torque down low in the RPMs. Which is what you want for mileage. Retarding the cam timing (when the cam gear jumps a tooth) is for power in the upper RPMs. The only bad thing about advancing the cam timing is you can't rev the engine to past 4500. Not many people I know drive at such high RPMs though.
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