Hi Andy,

Unfortunately I can't make the MX5 the second car, I'll be doing more miles in the MX5 than the Tuscan, which makes the MX5 my main car :-(
What I meant was:
1/ Terminate your current MX5 insurance
2/ Take your current no claims from this & get Tuscan insurance with a TVR insurance specialist (Sunninghill, Cheam, Manning etc)
3/ Negotiate a 20% (or more if lucky) discount with a different insurer for your Mx5 (Try Tesco's web site)

There are a whole bunch of people with Tuscans who claim to have driven their Tuscans sensibly but are still going through tyres every 6,000 miles, then there are another bunch who admit they drive like nutters and are getting more than 6,000 miles. It seems like the most likely explanation for this is that the factory got the alignment settings wrong initially. Some people have reported improved tyre wear after using a different alignment setup that the factory has now provided.
Another explanation is that the alignments are set up for driving the car like a nutter :-)
I'm being half serious here, as I know that this was the case with the Prodrive suspension setup on my last Subaru - if you drove it sensibly, or only on the motorways, the toe-out meant that the tyres wore very unevenly. If you thrashed it everywhere, it had even wear across the front tyres. "Honest officer, I was just looking after my tyres"

I think you're probably right on the wheel front - the large wheels have incredibly low-profile tyres on them & must soak up a lot of punishment.

cheers
Craig