Sounds exactly how propane fuel acts in cold weather :)
Do you think the device would have any likely benefit on other fuels used in cars, like Propane / LPG? Propane doesn't need vaporisation as it's already a gas and it will actually benefit from a stone cold intake.
As for the costs, depending on your manufacturing costs, I think it would be a 'simple' choice between desired profits over a small amount of sale volumes, or a little less profit per initial device, but likely more profit because the sold/produced volume is larger.
