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Re: Miles per Gallon?
Don't ever draft behind a truck, this could be extremely hazardous to your LIFE. You would be too close for safe stopping distance and your field of view would be too restricted for safe driving. An extra 1 or 2 MPG isn't worth dying for.
Don't turn engine off either when driving. You could lose power steering making the vehicle very hard to steer and its not good for your vehicle.
There's no parts you can add to increase mileage, only parts you can replace. If your vehicle has over 60K miles, you may need spark plugs and plug wires, both should be inspected and replaced if necessary. If the "check engine" light is on, you may have a faulty sensor that effects engine performance. Be sure engine oil and filter is changed at regular intervals and you use the recommended viscosity (probably 5W-30 for your vehicle but check owner's manual or label under hood). Be sure all lubricant levels are at recommended levels - this includes, engine oil, transmission fluid, transfer case (if 4WD), and differentials.
The vehicle's Powertrain Contol Module controls almost all the engine operation so there's not a lot more that can be done. As you can tell from other comments here, some vehicles just do better than others for whatever reason. Driving habits effect MPG too.
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