driving hard all day and getting 45mpg is not realistic, i agree.
driving normal i get 45 easy. (have fuelly tracked every singlee fill up since day one, to back this up)
but it is commonly agreed on that TDI's do exceed EPA estimates of 34MPG for current new TDI's
according to Fuelly or fueleconomy.gov current TDI's most average around 40-43MPG,
and thats 20%+ over EPA
and this is the part that alot of people like to overlook.