Hello is 3.8 l a good enough conversion factor for a US gallon for every day use. The difference between 3.78 l and 3.8 l is only 20 ml.  The everyday conversion factor for the imperial gal. is 1 Gal = 4.5 l.  I believe the proper conversion factor is 1 imp. gal = 4.54 l.  This is a difference of 40 ml whitch is quite a lot more.  Thanks.      

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