I understand that perspective. The only one I can verify personally is the 440+6. That was my own daily driver and I'd wager the mileage was lower because I beat the **** out of it pretty much every time I started it for two years. My 383 4bbl newport did get past 20mpg on the highway when my foot wasn't in it and the nitrous was empty. The others are reported from customers I built the engines for so I took their word for it.
