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Evaporative emissions are less of a problem nowadays. Fuel systems in modern vehicles are sealed, and the computer warns the driver when a leak is detected. Further, many counties require DEQ checks which include the requirement that the vehicle not have any leaks in the fuel system.
Gas cans are even required to be sealed. I remember as a kid having metal cas cans with an unsealed metal spout. All gas cans sold now are sealed up, and I don't have a single old can anymore that is open to the air.
I'm also curious what the allowance of the regular fuel will do for fuel economy.
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