Put new plugs/wires and a coil pack if you have the money. Fill up and check mileage accordingly and you'll be pleased! When I bought my 3.0 with its tiny tires it was getting 17. Each full tank my mpgs got worse til it got to 13. I put new plugs and started getting 22

__________________
White '99 Ranger 4x4, 3.0, 5 spd. Torsion bar lift, 32x11.50 BFG All Terrains on Ion Alloy 15x8 rims, Custom Magnaflow turnout exhaust, K&N drop-in air filter, Cobra Super 19 mini CB, Sony Audio system and custom white dash trim, Air horns, throttle cable mod, airbox mod, manual hubs mod, 200k miles & PAID FOR
Rangers > Jeeps!