Hey guys, I am new to the forums and am really interested in gettin a Q7, used to own an Allroad 2004, loved it want to get back into an Audi

I am looking for some advice from all the owners of the 3.6 vs TDI, which is the right way to go is the TDI mileage worth the extra premium you pay to get it? will one last longer than the other? looking for this to be the family hauler for the next 7-10 yrs...other cars i have been looking at are R320/R350 TDI's GL320/350 TDI's and X5 3.5d's

thanks for any advice!