2004 GMC Sierra vs. 2006 BMW 645
To start off, 2006 BMW 645 is newer by 2 year(s). Which means there will be less support and parts availability for 2004 GMC Sierra. In addition, the cost of maintenance, including insurance, on 2004 GMC Sierra would be higher. At 5,963 cc (8 cylinders), 2004 GMC Sierra is equipped with a bigger engine. In terms of performance, 2006 BMW 645 (328 HP) has 3 more horse power than 2004 GMC Sierra. (325 HP) In normal driving conditions, 2006 BMW 645 should accelerate faster than 2004 GMC Sierra. With that said, vehicle weight also plays an important factor in acceleration. 2004 GMC Sierra weights approximately 582 kg more than 2006 BMW 645.
Because 2004 GMC Sierra is four wheel drive (4WD), it will have significant more traction and grip than 2006 BMW 645. In wet, icy, snow, or gravel driving conditions, 2004 GMC Sierra will offer significantly more control. With that said, do keep in mind that many other factors such as speed and the wear on your tires can also have significant impact on traction and control. Let's talk about torque, 2004 GMC Sierra (502 Nm) has 52 more torque (in Nm) than 2006 BMW 645. (450 Nm). This means 2004 GMC Sierra will have an easier job in driving up hills or pulling heavy equipment than 2006 BMW 645.
Compare all specifications:
| 2004 GMC Sierra | 2006 BMW 645 | |
| Make | GMC | BMW |
| Model | Sierra | 645 |
| Year Released | 2004 | 2006 |
| Body Type | Pickup | Coupe |
| Engine Position | Front | Front |
| Engine Size | 5963 cc | 4398 cc |
| Engine Cylinders | 8 cylinders | 8 cylinders |
| Engine Type | V | V |
| Valves per Cylinder | 2 valves | 4 valves |
| Horse Power | 325 HP | 328 HP |
| Torque | 502 Nm | 450 Nm |
| Engine Bore Size | 102 mm | 92 mm |
| Engine Stroke Size | 92 mm | 82.7 mm |
| Engine Compression Ratio | 9.4:1 | 10.0:1 |
| Drive Type | 4WD | Rear |
| Number of Seats | 5 seats | 4 seats |
| Number of Doors | 4 doors | 2 doors |
| Vehicle Weight | 2274 kg | 1692 kg |
| Vehicle Length | 5790 mm | 4830 mm |
| Vehicle Width | 2130 mm | 1860 mm |
| Vehicle Height | 1880 mm | 1380 mm |
| Wheelbase Size | 3650 mm | 2790 mm |
| Fuel Consumption Overall | 15.7 L/100km | 11.8 L/100km |
| Fuel Tank Capacity | 102 L | 70 L |
