I've had my RAV4 for about a year now. When I first got it, I got about 23-25 mpg. In the last month or so my mileage dropped to 17-18 mpg. It has about 88k miles. I figured it was time for a tune up, so I changed my oil, plugs, plugs wires, cap, rotor, fuel pump, air filter, and cleaned out my throttle body and egr valve. None of this has helped at all. According to my Haynes manual, my ignition coil reading just as it should. The air pressure in my tires is fine. It just had an alignment. The truck drives great, it just sucks down too much gas. Any ideas anyone? Thanks.