My daily commute consist of mainly highway but i live in the city so its a fair mix... If i am just cruising and not aggressively driving I can average 17 MPG but if i am aggressively driving I only get around 14 MPG....I have a 4.8 also....

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02-Ducati 748
04-E55 - Keyless go-Trunk closer-Pano Roof-lighting package-Premimum Package-euro command-parktronic-dynamic seats-V1 radar,heat/ventilated seats/multi contour-Navi-Tire Pressure MOnitor-Kleeman K1 performance package-Sprint Booster-E63 rear spoiler-F1 shift Paddles-SOLD
07-BMW 328xi Coupe - fully loaded.
07-BMW X5 4.8is - COld weather package-Premium Package-Sound Package-SPort Package-Technology Package-Comfort Access System