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Usually when you increase the wheel size, the overall diameter stays the same because you get thinner tires.
Anyhow, putting heavy 18s on your car could potentially decrease mileage if they're heavy and you put high performance tires on. Heavy wheels means more rotational inertia. High performance tires are stickier and have more rolling resistance. Plus the wider tire will create more aerodynamic drag.
Keeping the diameter the same, my friend increase mileage by almost 10% dropping 10lbs per corner going from stock cast to BBS forged wheels with the same diameter. At the same time though, the car became a lot more fun.
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2007 Camry 2.4L 5M
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