How many pounds/kilos does it take to change the mpg in your car?

I've heard a myth that losing weight may give you better gas mileage? I doubt it would make a noticeable difference...But how much actual weight gain/loss (i.e. cleaning out the car, buying lighter parts, weight loss) would it take to affect mpg??How many pounds/kilos does it take to change the mpg in your car?In a practical world, if you do not have your car loaded with sand bags in the trunk, forget it about it getting lighter for saving gas, keep your tires a little above your normal tire pressure ( 1 or two pounds) your tire alignment have to be perfect, clean air filter, good oil and filter changed and forget about getting lighter and you'll be notice the change on the milleage.

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