I had an 05 f150 5.4 4 speed b4 I an can definatly say it has way better gas mileage . I average about 13-14l/100km in the city .can do about 11l/100 km on the highway between MTL-Ottawa
The truck has about 4k on it now and the fuel consumption is not as advertised but its not far off .
As for future plans , I'm tempted to try some tuners with intake and exhaust but the tuner will void my warranty and I'm prolly not gonna do intake exhaust without the tuner. It's basically a work truck but god damn does it blow the doors off the 5.4l .
I highly recommend the f150 ecoboost for any1 looking for a 1/2 ton truck