Denali....6-speed box vs 8-speed

[Chilli]

Does anyone have any experience of the difference (apart from 2 gears)?

Been offered a cracking deal on a Denali, which is top-of-the-range, but has the older 6-speed box.

Apart from tiny fuel savings, does anyone know of any other major differences?

[Chilli]

Many thanks.
Too good a deal to ignore, I think.