By the tank, 25 to 37 mpg
We never used an entire tank of gas for city driving; but when we did fill up and watch the trip computer, we seldom saw our average fall below the 26-mpg mark around town; and we think that's good, considering there were a lot of cold starts and short trips. Most of the time we saw figures in the 28-30-mpg range as we did errands around the Portland area—whether near my more urban neighborhood or Joel's more suburban area.
Joel saw a low tank average of 25 mpg in a combination of city driving plus some high-speed commuting, in Minnesota. I saw our best tank average, at more than 37 mpg, predictably on a tank spent during the heavily patrolled Memorial Day weekend, over 55-mph two-laners and slow-but-steady traffic-clogged Interstate.
By the time Joel brought the Veloster back to Portland it had passed 7,000 miles on the odometer. My first time in the car since then, I noted that it was not only returning slightly higher mileage on the trip computer but it also felt a little more sprightly, with the dual-clutch automatic doing a better job than before in reading my right foot.
Addendum: Lower EPA ratings than we thought
Incidentally, this past week, as we made plans to turn the car back in, and as we started to look at the numbers on our fuel log, Hyundai Motor America and Kia Motors America announced that after discussions with the U.S. Environmental Protection Agency (EPA) they're voluntarily adjusting the EPA fuel economy ratings downward for about 900,000 2011-2013 model year vehicles.
Those include our 2012 Veloster which, with the dual-clutch (DCT) gearbox, came rated at 29 mpg city, 38 mpg highway (32 combined) on the window sticker. Last week's adjustments make its ratings instead 27 mpg city, 35 highway (30 combined).
Considering both that our habits probably include a heavier right foot than your typical driver, and that our 30.6-mpg average weighed heavier than typical on highway driving, we think that the new adjusted figures are very close to what you're going to see in real-world driving.