Yes i have checked and its off by about 2mpg. I basically do the math. Fill up gas tank and write down miles. Then when i am down to like 1/8 tank i fill it up and write the mileage and gas used to fill up. The lie o meter told me 30mpg and the math told me 28mpg. Also when i fill up gas tank and the gas pumper stops i am still able to add like $2 more gas. And i drive a 2021 santa fe hybrid limitedAnyone check their actual fuel economy against the lie-o-meter. 2021 SF limited turbo.