add another one...checked my level today after 1500 miles & found it down a littler over 1/2 a quart...took 20 oz to top it off so it's about 1/3 a quart every 1k miles....truck only has 7500 miles on it..been using Mobil1 since it's first change at 1200 miles....my 07 2500 with the 6.0 never burned a drop, neither did our 07 Tahoe with the 5.3 AFM either...