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For many people, that $6 savings isn't worth the extra hassle.
I've brought fuel cans for lawnmowers to extend the savings benefit before, but I wouldn't monkey around with filling gas cans and later filling the car, especially since it makes calculating MPG more difficult.
I once had the maximum Safeway discount ($1 per gallon) and took maximum advantage by filling my diesel truck. The limit is 25 gallons, and that's what I filled the tank with (35 gallon tank). Then again, this was back when diesel was $5 / gallon, so I still lost $100.
Back in those days, I could put $20 in the tank and that wouldn't be enough to even turn the low fuel light off.
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