I tried to "test" my '07 RT tank volume the other day. Got to my home town with 6 miles to empty (as stated by the computer) so I chickened out and filled up. All I could cram into the tank was 5 gallons. The manual states 7 gallon tank. I figure there's bound to be some air space that's unusuable, but 2 gallons? I drove 40 miles after the warning light came on.
Or is the computer that poorly calibrated. I gotta believe the Germans are better than that.
Any real life experiences as to tank volume?