tHe_sTiG
New Member
- Joined
- Jan 28, 2010
- Messages
- 190
- Reaction score
- 2
- Points
- 0
- Location
- Saudi Arabia
- Members Ride
- VZ Executive
Hi there guys,
I'd like to know how to drive my car with optimum fuel economy and with the least wear on engine and transmission. My current VZ Exec (175 kw, 4 speed auto GM4L60) is my first car and I don't quite understand everything about it... yet.
The town I live in usually has quiet roads, so I set my cruise control at the speed limit - 60 km/h. However, the transmission goes back into 3rd when I do this. When driving normally with no cruise control on at that speed, transmission stays in highest gear.
So... why does it shift down to 3rd when in cruise? I thought lower revs = less fuel. Does it improve fuel economy? Should I only use cruise when on the highway, 80+ km/h since it does select highest gear when above 70 km/h.
I'd also like to know... what's overdrive for exactly? Is it 4th gear, or something else?
I'd like to know how to drive my car with optimum fuel economy and with the least wear on engine and transmission. My current VZ Exec (175 kw, 4 speed auto GM4L60) is my first car and I don't quite understand everything about it... yet.
The town I live in usually has quiet roads, so I set my cruise control at the speed limit - 60 km/h. However, the transmission goes back into 3rd when I do this. When driving normally with no cruise control on at that speed, transmission stays in highest gear.
So... why does it shift down to 3rd when in cruise? I thought lower revs = less fuel. Does it improve fuel economy? Should I only use cruise when on the highway, 80+ km/h since it does select highest gear when above 70 km/h.
I'd also like to know... what's overdrive for exactly? Is it 4th gear, or something else?
Last edited: