Well there was this:
Starting to think that may have been photoshoped...
https://www.fuelly.com/car/chevrolet/express_3500/2019
Show these van only getting "Based on data from 14 vehicles, 627 fuel-ups and 206,629 miles of driving, the 2019 Chevrolet Express 3500 gets a combined Avg MPG of 13.87 with a 0.37 MPG margin of error."