Saab 9-3 some revisions in 2011 for the 2012 model year. Changes were in the engine range with an overall reduction in diesel and petrol engine fuel consumption of 12% and 7% respectively. An entry-level 163 hp, 2.0-litre gasoline / BioPower engine was added for 9-3 saloon, estate, and 9-3X models with Saab XWD. Other changes included rear badging in line with all new Saab 9-5 saloon, 'ice block' style headlights, New bumper design, titanium metallic effect trim around instrument panel, gearshift, doors and glove box. Aero gets graphite fiber effect. Contrast stitching on leather upholstery. In most markets, car was badged
7-limit tuning Young's "The Well-Tuned Piano", Ben Johnston's String Quartet No. 4, and Lou Harrison's "Incidental Music for Corneille's Cinna". The Great Highland Bagpipe is tuned to a ten-note seven-limit scale: 1:1, 9:8, 5:4, 4:3, 27:20, 3:2, 5:3, 7:4, 16:9, 9:5. In the 2nd century Ptolemy described the septimal intervals: 7/4, 8/7, 7/6, 12/7, 7/5, and 10/7. Those considering 7 to be consonant include Marin Mersenne, Giuseppe Tartini, Leonhard Euler, François-Joseph Fétis, J. A. Serre, Moritz Hauptmann, Alexander John Ellis, Wilfred Perrett, Max Friedrich Meyer. Those considering 7 to be dissonant include Gioseffo Zarlino, René Descartes, Jean-Philippe Rameau, Hermann von Helmholtz, A.