Been doing a bit of a thinking, this is probably a bit daft given it's twice my original budget and not a diesel but am liking the 350Z. My driving mainly consists of a little round London, not that much so I don't really care about urban economy, it's more that I don't like to take the Impreza on long journeys, the 350Z has a 6th gear which I assume would make it much more economical? Is that logical?