In town diesel will get you about 5MPG better than the gas equivalent and on the highway it's almost 10MPG better. In the case of the 3.0L diesel it's also *quite* fast. 5.5 second 0-60 with as much torque as most V8 pickup trucks *and* almost 40MPG.
Not according to Audi's website. These are of course the A6 because the A4 isn't available. Will it be that much different?
A6 Technical Specifications
2.0 TFSI®
EPA estimates | Capacities
City - 25 mpg
Highway - 33 mpg
Combined - 28 mpg
3.0 TFSI®
EPA estimates | Capacities
City - 18 mpg
Highway - 28 mpg
Combined - 22 mpg
3.0 TDI®
EPA estimates | Capacities
City - 24 mpg
Highway - 38 mpg
Combined - 29 mpg
Seems it worthwhile comparing the TDI to the 2.0 since the performance specs are nearly the same. The 3.0 TFSI seems like its in a different class, at least by the performance numbers, even though its the same size. Not to mention supercharged vs. turbocharged.
Like I said though, nothing eye popping about the diesel. Will the A4 really be that much different between the gas and diesel versions?
Edit: I guess the debate really is which gas engine to compare it to. Neither is really a good "direct" comparison and cases could be made to use either. But combined the 3.0's are still 7 mpg difference. That's pretty good I guess.
Of course the diesel gets more torque. That's like saying water is wet.