Hated it Blondie, I mean, it was a lovely big car but absolutely useless.
The car before was a Mercedes V-class (7 seat people carrier) which was a fantastic big car, I could carry my massive R/C aeroplanes, snowboards, bikes, tools, garden materials, DIY stuff, you name it I had it in there including a 4.5 metre long heavy steel beam for removing a supporting wall in my kitchen/dining room.
A few days after buying the Porsche, the oldest daughter and I went to go snowboarding and I couldn't even fit 2 snowboards in the boot
immediately, I knew it was a mistake.
Fuel consumption on the Apollo was probably less, at one point I calculated approx 7-8 mpg, it was a 4.5 litre V8 though so I wasn't buying for fuel economy but it was astronomical. I hear the diesel is obviously much better.
Resale was hard too, luckily for me somebody wrote it off when it was parked up and I got a good price back for it (around double what I had sold it for the day before on eBay), I had it for sale for around 3-4 months before that happened and was starting to think I was stuck with it... I mean, there's worse things in life than being 'stuck' with a Porsche but the fuel economy was really taking the enjoyment out of driving it.
I'm afraid I can't compare it to the touareg as I've never owned one but it is essentially the same car, the only difference other than subtle bodywork is that one is finished in the VW factory and the other is finished in the Porsche factory and costs a lot more... I just wanted to own a Porsche for a while. Also, I may be wrong but I think the touareg is available in a better range of engines.
All in all, the only Porsche I'd ever consider again is a classic 911... I'm considering my itch, scratched. I've bought another Mercedes v-class to replace it.
Hope this helps.