Join Date: Aug 2008
Location: SE London
Vehicle: SLC43 AMG, 2018 update (390bhp) Designo Hyacinth Red with AMG Ride Control suspension
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I don't think you would shave off more than a few pounds from the combined weight of driver, fuel, car, car wheels etc
Sorry to pee on your bonfire but it is chasing a negligible holy grail!
More effective ways of cutting the laden weight of the car are: removing all the carpet, glove box door and other trim items, passenger seat can be removed if it is driver only.
Be sure to calculate how much fuel you need for the journey to the next gas station as this is likely to save AT LEAST 50Kg / 100LB.
Lesser benefits come from carrying the minimum of windscreen washer fluid, only wearing underwear and no shoes.
Finally, probably the most effective method by far is to Google "Jenny Craig" rather than "micro-light alloy wheels" because most of us carry 10's of LB of extra weight that we really don't need our car to have lug around, slowing us down.
(I do balk at airline check in when they are concerned about me having 7.2Kg of carry on luggage when a 120Kg obese person just waddles on nonchalantly guilt free!)