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Originally Posted by Janey
mostly because of budget. I know that I only have $20 per week to spend on gas. So I put in $20 every sunday night. Regardless of the number of litres it purchases, that's all that I can budget for.
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In that case stop the pump at a nice round figure and check the price. If Canadian petrol stations are anything like English ones you'll notice that prices vary drastically from place to place.
The human brain has a remarkable ability to remember figures when they have a £ ($) sign in front of them.