When I had my 5speed F150 With the 3-0 straight six I shifted at 10 20 30 40 and45. I got @25 mpg even with the hevier truck.

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04 Phillies Red Ranger Edge King Cab.3.0L v6
Stock wheels w/235/75/r15 Goodyear Wrangler Radials
Pioneer FH P8000BT,Pioneer CDX-1280 12 disk changer,TS-A874M frontspeakers and TS-A6872R rear speakers,explorer lighted visors(per wife's request)Cold Air Intake Mod.Explorer Dome light.Freshly repainted front clip,Pretty much still stock!