hi alga
as far as i now thats about it ally is lighter and does not go rusty on the under side of the car. though its midnight and iv just come in from the garage so am very tired..
i have an ally floor and tank floor is 1.7mm tank is 1.6mm i think.
my theory wilst bulding has been that iff you can take a little weight off eash part even iff it is only grams in some cases it all adds up and at the end of the day you may walk away with a 20KG weight saving and in a 500-600kg car 20KG is quite abit.
hope this helps
tilly
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