Randy, I'm not sure what the EPA fuel mileage numbers will be, but I can tell you the ones I've driven say about 18 MPG average for city (aggressive) driving on the LED on the readout. We don't use cylinder deactivation (MDS) like the 5.7L, but we can't since our lobe lift on the cam is higher than a MDS lifter can take. Our valve lift is 14.5mm (.571"). Wolfgang Bernhard (from Mercedes) used to be a VP at Chrysler when the idea of the 6.1L came into being. When he was asked about putting MDS on this engine he said, "None of that sissy stuff here. This engine is all about power, and nothing else." That guy had the right attitude.

The most challenging parts of this engine were the valvetrain (at one time we had 3 engineers working full time just on the cam profile and spring durability) and the piston/ring/rod/bearing upgrades. The piston/ring/rod/bearings are mine. Basically, any moving part on this engine was a challenge to make pass the DCX truck durability schedules. One of the durability schedules runs from peak torque RPM to 50 rpm below fuel shutoff (6350 rpm) for 775 hours. That's a killer for any moving parts.
It's the highest specific output engine DCX has ever made and we're not launched yet, so there is still work to do.
Anyway, just had to boast a little. We're patiently waiting for GM to put the LS2 in the GTO and the CTS-V so we'll have some competition.

Those 2 cars aren't exactly in this car's target market, but right now, even the 300C has no competition from either GM or Ford for anywhere close to the price. We just stepped it up to make it harder for everyone else to match us. I have to tell you that right now I think SRT is doing some really good stuff. The Viper is the only car SRT makes that isn't kicking the competition's butt, but we'll make that right soon enough.