I doubt if 2psi will make much difference. Better to change your style of driving e.g. easy on the throttle, easy on the brakes, no hard acceleration. This will give you improved fuel mileage, do not mess with the tyre pressures.
There is no magic to increasing the mileage. Make sure the engine is running the best it can. New plugs, wires, vacuum hoses, air filter. Correct air pressure in all tires. Drive for mileage, as in, take off slow, drive the speed limit. Other than that, there is not much you can do. Don't waste your money on so called, mileage enhancer devices. They do not work, and will only lighten your billfold.
Your vehicle will not run if you bypass the computer. Nothing you can do to the computer will increase fuel mileage. Assuming the engine in your vehicle is running properly, keep your tire pressure as outlined in your owners manual, carry as little weight in the vehicle as possible, take off slowly and drive the speed limit. Other than doing this there's nothing you can do to increase fuel mileage.
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