So this might be the stupidest question ever, but should I get a fiesta ST or the focus RS?

>100 mile round to commute to work
jeebus cribes, get a fucking heavy ass, comfy sedan. DDing a fun/sporty car that far everyday will quickly get old.

It didn't have the same driving feel or personality as the fiesta. The focus made me grin, but the fiesta made me smile ear to ear

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Fiesta ST owner here, agreed. My commute is like 16 miles to and fro and even I wish I had a car with softer suspension some days.

I would say don't get either because of how many problems Ford has with their ecoboost car. You could take that Fiesta money and get a good condition WRX

I own a Fiesta ST and have driven a friend's Focus RS enough to get a good impression of it. (I drove it on city streets to the freeway, 35 miles on the freeway to our favorite canyon road, a few runs on the canyon, and then back home.)

The RS is in a whole other world when it comes to being exciting. Just stepping on the gas in a straight line will put a grin on your face, it feels even faster than the numbers would suggest. The whole "driving mode" setup is great too, and it goes from comfy freeway mode to stiff track mode better than anything I've ever driven. (Including the F80 M3 and 991 GT3.)

The FiST, on the other hand, will be vastly more economical for your commute. It gets almost twice the MPG on the highway (I get around 38 when cruising at 75, while in the RS I couldn't get over 22) and uses cheaper gas. I also think it's a perfectly comfortable car for long drives, I had a 40mi each way commute to my old job and have done quite a few LA-SF trips in mine, and it's great. The Recaros really help if you fit in them, I'm 5'11" with a 34" waist and they're the most comfortable factory seats I've ever had. The whole point of the Fiesta ST is to be a commuter car with added "fun factor," and it does a great job of it.

One thing I really really disliked about the FoRS is the stop/start function. It's very badly implemented and actually stalled me out in the middle of an intersection at one point. (The light turned green just as I stopped, and the car turned itself off after I'd gone like 15 feet.) You'll probably find yourself making a habit of disabling it as soon as you start the car.

You can get a mustang GT for the price of an RS

Yes, but they're completely different kinds of cars. The Focus is more practical as a DD and it's more fun on twisty roads. I'd probably get the Mustang if I lived somewhere flat with straight roads and intended to track it, but the Focus is better for places with mountains.

Have you had any problems with your fiST? Anything that needed to be covered by warranty? Any oil leaks or burning? That is my really biggest hang up and the only reason I'm slightly considering getting another Corolla is all the supposed problems with the eco boost engines

Do the financially resolonsibke thing and don't buy a brand new cuck mobile
Instead buy a cheaper used proper sports car