PolitiFact's March 7, 2016 rating of Democratic presidential candidate Bernie Sanders (I-Vt.) suits our purposes well, with Sanders claiming Flint residents pay three times for water what Sanders pays in Burlington, Vt.
PolitiFact found Sanders was right if it used outdated water rates:
When we look at average annual bills from January 2015, Sanders’ 3-to-1 comparison is pretty close. But after August, Flint customers were paying a little more than twice as much as Burlington residents.A judge's order in August 2015 rolled back water rates. Therefore, as PolitiFact notes, Flint residents now pay about twice what Burlington residents pay, counting Flint's charges for the home water meter. Burlington doesn't charge for the water meter.
To us, it's okay if Sanders wants to round up to get to his "three times" figure. So for PolitiMath purposes, we'll calculate how much 2.5 exaggerates the difference in water rates between Flint and Burlington.
Going by PolitiFact's chart, "a little more than twice as much" turned out to be about 2.4, leading to a very modest exaggeration on Sanders' part: about 4 percent. Yes, allowing for rounding up helped Sanders immensely. That's okay. We'd handle this the same way for a conservative.
PolitiFact gave Sanders a "Mostly True" rating, by the way, for a claim that was literally false.