Gallons don't do much for you in South America. 5 liters is a reasonable size to carry. I hardly ever used my extra fuel--the only real issue was headwinds in Patagonia, which sometimes halved my mileage. Oh, plus one of the Andean passes--Paso de San Francisco, I think.
The real question is what are you doing to that poor Strom to get such miserable mileage? I've never gone below 50 on mine, and I've definitely hit 70 (miles/US gallon). Unless you're burning high-ethanol fuel, like what's sold in Brazil, I'd be thinking about maintenance issues.
This advice worth precisely what you paid me for it, but in no case in excess of US$0.02.
Mark
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