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I see gas being much more possible trouble than diesel/veggie oil!
I would want it for long distances/values as Bestclimb has well stated.
I had a plastic tank custom built to fit the spare tire depression perfectly in a Vw diesel wagon.
I live in an area of much higher fuel costs. As per Bestclimb; I can fillup both tanks in mid-USA once, and get all the way home!
Spare tire depressions are low, and close to stock tanks, so simple gravity valves to original tank pretty easy; and veh. handling changes are minimum. (my tank holds between 11-12 gallons) Yes, the spare tire is up elsewhere, but for interstate type trips where hrs. per day is a constant fluid motion, the tinch of extra weight is far outweighed by your freedom in being more self contained, paying for fuel where it is a fair price.
In the future; it may be difficult to get any fuel at any price!
That's why I'm high on older simplist diesels. You have MANY options for fuel, some of which you can make yourself!
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