I know this has been discussed before. I haven't heard much on the 2.7 though. I test drove two 17' f150's. The 2.7 was definitely livelier and quicker. However, the 5.0 has got to be the best sounding engine I've ever driven. That sucker has a ton of power as well, just up higher in the rpm's. The 2.7 is about $1500 cheaper. Part of me is leaning towards the 5.0 for simplicity and it's more trucklike. MPG's were identical although the 2.7 is rated higher. It's a tough call.