A. Gas Stations are one place. Look closely at the pump and you’ll find a sticker from some County Dept certifying that the pump is accurate. If not, how would you know that you indeed pumped 10 gallons? Maybe it was only 9.3 gallons? Look around and you’ll see similar certifications (both government and private) all over the place.
P.S. There’s a local landmark store called The Honest Weight Food Coop, (see www.HWFC.com) with a new location just off the 90, near Everett Road. They somehow managed to transfer the character (and even smell) of the previous cramped locations to this new spacious store. Even with big players Trader Joe’s and Whole Foods moving to town, good ‘ol local Honest Weight stands apart, and has a loyal following.