I have a FX4 F150 3.73 Gear Ecoboost truck, so far 550 miles and on the highway going 70+ I get 18.5 mpg. It keeps getting better each run to work which is 60 miles one way. Ford says Motorcraft 5-30 was run in there test truck even in the BAJA 1000 so I see no need to run a 10-30. It also looks like a nightmare to change the oil, but I will probably do it at about 2000 miles, already have the new filters in the bullpin.