I would disagree on the Mini. Any money you save you will lose to repairs. BMW Mini's are not the best on reliability. I'd still rather have the old GTI.
My buddy is spending a ton of money on a Mini his wife had to have. Same on the BMW as they are affordable to buy but to maintain still cost.
The Caddy you can at least fix somewhat easy at home. The Toyota is usually rusted out as is the alternative.
I would pass on the Porsche and Nissan both. We have turned several 944 into track cars but they just make you want a V8. Just get a 4th gen Camaro cheap. I have seen low mile models for less than $10K in SS form.
I like the GTI I just wish they would just give it more power. The V6 model was great but rare. The 4 needs to be closer to 300 HP today. Heck my HHR SS would out run the GTI any day.
Gasoline detergents and their cleaning abilities can be proven though. And you can prove a cheap filter is not as good as some of the pricier ones.
As for your wife’s car, sometimes the octane recommendation is simply for performance. The ECU on modern vehicles will advance the timing as much as it can get away with to increase performance. Higher octane allows that. Lower octane will result in dialing back the timing, thus lowering the performance.
Had the VW 84 GT one of the best fun cars ever. Black with nice firm cloth buckets red striped. Handled excellent easy to fix. I'd take it over any of the other selections except the 350z is interesting.
You must have posted that,while I was typing my reply as it wasn't there. At any rate, there are turbo/super charging packages for the GM 3.6, that put out 500hp so maybe you saw one of those