Welcome, yeti!
What part of Ontario are you in?
From a *modding* perspective, the stepside may give you better gains, as you can build in some proper aero-friendly taper aft of the rear fender that you wouldn't be able to do as easily on a fleetside box.
However, you'll also need to "bridge the divide" forward of that rear fender from the trailing edge of the cab, backward.
So the complete answer might be: fleetside from cab to rear wheel, modified/tapered stepside from the rear wheel to the end of the vehicle.
Quote:
2001 chevy s10
2.2 4cyl
5spd
4.10 gears
high flow exhaust
true cold air intake.
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If you're willing to sacrifice some power for efficiency, do some searching on warm air intakes here. Warmer, less dense air = wider throttle opening for a given power requirement = lower pumping losses = higher efficiency.
Maybe a custom variable source intake - warm for cruising, cold at other times?
Also, I'm not familiar with the range of differential gears for the s10. Can you /would you be willing to go with taller gearing to lower cruising RPM?