At the risk of upsetting more than 50% of this forum, IMO a GTV is a bit pointless anyway - a very small 4 seater and a tin roof
I think it's all about cost, and why not do long commutes in a spider rather than a boring family saloon or hatchback?
With a high enough mileage, I think the financial argument could be more loaded in favour of LPG converted V6 GTVs than many cars:
* They are tough, reliable and capable of high mileage.
* They cruise easily and are relaxing to drive
* They have a bit of power to spare - I would doubt that 20 or so bhp would really be missed in every day use from the 220 available
* They are very good value to buy in the first place -a couple of thousand off the initial price would pay for a fair bit of gas
* They are not really sports cars for me - too heavy and front wheel drive- so no great disadvantage to the conversion.
GTV vs Spider could be a great debate.
Here's the opening shot:
GTV - less wobbly; less leaky; less noisy to drive; looks better with its pert rear compared to the Spider's huge butt; easier to leave in a bad part of town; better value to buy; climate control works better; no hood motors to fail and the back window is more likely to stay clear and not fall out; you can carry a third passenger (sideways) and they will have a seatbelt; safer if you roll over.
(This last bit has upset people in the past, but it is only a personal thing) - I sometimes feel enough like Kirk St Morititz in the GTV - I would feel like Louie Spence in a Spider! Just to be clear, this is a personal thing - I don't think that anyone else should think this or that Spiders are just for girls.
Spider - bigger boot; if you are into convertibles there are few that are prettier; do not have any "race me" boot spoilers.