unless you live miles from a pump, why not only fill it half way and fill twice as often, that way you're not driving round with the extra weight of half a tank of gas, which in the long run could save you a lot of money.
People don't really "need" much of anything if you put it that way. I didn't really "need" my Chevy 1500 when I had it, but I liked it and I could afford it.
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