For anyone that's not an enthusiast and wants a new car that's inexpensive to operate, I always recommend the Corolla. It's not the least expensive in terms of pricing, but in terms of long term value, it's really hard to beat. The 11th generation is a very nice car that offers a lot of great features for the money.
First, don't buy a manual. Yeah, I love DIY shifting, but the CVT Corolla and others offer better economy and DRAMATICALLY better resale value. If you're minimizing costs, the extra upfront cost of an AT is more than offset by the later resale value.
Second, don't buy either a very base car or the very top trim. Base models without any creature comforts again are resale dogs and the top trim levels sell easily, but for the same money as the "mid" levels. So get something with some nice stuff, but don't get the top trim with all the packages.
For new, I'd either go with the Micra or Corolla in terms of minimizing costs. The Micra is a decent car and the price is low - especially if you're prudent with the options. The Corolla is a much nicer car that offers a lot more creature comforts with no real economy penalty, but you will pay more upfront.