The 2006 Dodge Ram Pickup 1500 ST 2dr Regular Cab SB RWD has a 3.7 L, 215 hp V6 engine.  This trim has 2 doors, seats 3, and tows up to 9100 lbs.  In manual, gas mileage comes out to 16 mpg in the city and 21 on the highway.  In automatic, the figures come out to 15 mpg in the city and 21 on the highway.