Well after reading all of these im getting pretty good mileage. my ranger is stock pretty much has a K&N & plugs are over gapped slightly on a 2.3L with a 5 speed trans
Last time i averaged it was my drive from Phoenix Az to Gallup NM & its about 350 miles
average was just under 30 mpg on the highway

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1996 XLT 2.3L 5 Speed 2WD
Electric Fan - Screamin Demon Coils & Firewires
MagnaFlow Exhaust - Cold Air Intake
12" Front Brakes
Gray 16X8 Cobra's - 225 50 R16
Smoked Altezza Tail Lights
Clear Signals & mirrored bulbs