Well, I have to stick my nose in and say that yes, the technology is there. Anyone with a properly tuned turbo knows that. Sctty411's car gets 40+ mpg on the highway and he's making some very nice numbers. A couple of years back, there was a 400 whp MR2 in one of those magazines that averaged 37mpg. The technology has always been there. The key is having the right size turbo. But the only downside to that is within those maps, there's fuel taken out to make those numbers which causes it to run lean, which in turn shoots up the NOx levels. With the Diesel technology, urethea injection could bring down the NOx, and with the proper gearing, even the trucks could make that possible. But that would mean goodbye to big V8's. Fuck em, we don't need them anyways. Ford's next line of fuel efficient big vehicles are gonna be turbo'd with the elimination of most of the V8's. In the coming years, ya'll are gonna be very familiar with the "Ecoboost" name.