I have owned a 1994 ,1997,1999,these were gas with 318 engine. got 15 to 16 mpg highway, so I herd about cummins with great fuel milage. so I picked up a new 2001 4x4 quad cab,stock rear put 47000 miles on it all highway ,in 30 months my fuel milage was the same from day one to trade for new 2003 truck. milage was 16 around town the little I drove it in town.highway was18.5 never change also truck was automatic.my 2001 was 215 hp, my new 2003 is 250 hp same everthing and my milage is 19.5 highway at speed of 65mph also same speed as 2001 just a little better.took truck to florida from ny last year and speed was 70 to 80 mph, watch mpg drop at 80 I got 17 t0 17.5 the cummins does not like high speeds for good fuel mpg.the 2003 is 13 months old and have 23000 on it now,still mpg is same from day one. cummins says no brake in needed so I guess thats why both 2001 and 2003 mpg was always the same from day one on.I here about people getting high 20s but I think they must not drive over 45 to 50 on highway . will be looking at the new ho with 325 hp next truck, would like to her some facts on mpg .

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