The length of the straight-six was not a major concern in the older front-engine/rear-wheel drive vehicles, but the modern move to the more space-efficient front-engine/front-wheel drive and transverse engine (left-to-right versus front-to-back) in smaller cars made the length of the V6 a major advantage. The overall length of an engine may be approximated by adding the bore pitch times the number of cylinders in one bank, plus the width of one connecting rod. As a result, in recent decades automobile manufacturers have replaced most of their straight-six engines (and many of their V8s) with V6 engines; Nissan have replaced their earlier turbocharged inline-6 models with larger displacement naturally aspirated V6 engines while maintaining the FR setup.