Was it the gearbox?

[Kiels3927]

A few thousand kilometers ago, the sum cracked was off the auto box on my 2007 Multivan, it was fed a sacrificial oil refill & a run before a new filter & refill. Over the last weekend, I travelled from Brisbane to Ungarie and back, around 2300 km total.

Before the gearbox resuscitation, I would have expected to average just shy of 10l/100 km. This time it was 8.3 km on the down run and 8.5 back.

Can this be attributed to a healthier gearbox?

John

[Umai Naa!!]

If it were slipping, then perhaps it would use more fuel.

Were the engine and transmission control units reset?

[Kiels3927]

Gearbox, Yes; engine, don't know.

[Kiels3927]

After two more trips, I'm detecting an issue. The cruise control doesn't hold as tight a speed range as it did reading off my GPS. Once, I could expect it to drop back no more than 2 km uphill & maybe three down hill. Now, it seems to be double that.

How should I address this?

On the other hand, economy is still great. 856 km Brisbane to Raglan & refill at Childers on the way back returned an exact 8 km/l.