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I wouldn't call a 5.0 "just a fanboy engine" as some have suggested. They're getting 390tq, 420hp out of 4.951 liters. They have power everywhere in the RPM range, run as smooth as any Lincoln or Cadillac anywhere in the RPM range, and while I know we don't buy cars like these for fuel economy, it is still a bonus to be able to get around 30 MPG from a 400+ hp engine with the cruise set on the interstate, as mine does.
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The 5.0 engine is an amazing piece of engineering getting 420 hp out of 5L with great fuel economy. However, no matter how amazing it is and how much technology has been put in for all "practical" purposes the LS3 still has higher peak output, more power throughout 90-95% of the powerband due to a 1.2L advantage, slightly less weight although it's close, is more compact for easier fitment, and essentially returns the same fuel economy.
The mustang is a faster car right now, but I still think the LS3 engine no matter if it uses pushrods and doesn't have x/L hp output is still the better engine.
I still can't wait to see what the 5.0 will be able to do direct injected.
And just curious, at what speed are you able to pull off 30 mpg?