Hi, welcome to the AE Forum.
Have you narrowed it down to any particular area as yet? The costs are a little different depending on your area.
The GoDutch web site has some good information for the Central Valley:
Central Valley Costa Rica cost of living Expat focus also offers an article,
Costa Rica cost of livingI believe that utilities are much less expensive here. Especially if you live in one of the more temperate climates. Car gas is more expensive per gallon (liter), but maybe you won't have to drive as much. Probably you will get into a more economical car, like a turbo diesel SUV versus a V8 full size you have back home.
Another savings is medical care. Currently a visit to the doctor or dentist runs about $25-30! Many cosmetic or optional surgeries can be done here for 1/3 of their cost in the U.S. or Europe.
I can add that the rule of thumb for car insurance is 5% annual premiums for the market value of your car.
Another rule of thumb is that when you buy locally made items or food, it is much less expensive than when you buy imported items. You can live as cheaply as you want if you grow your own food, or failing that try to buy what is commonly grown locally. I guess a good example of that is the cuts of meat. If you want to buy a T-bone, for example, good luck finding that in your local MegaSuper. But you can find it in upscale butcher shops, and you will pay upscale prices. You can find a cut called lomito at a reasonable price, that is a fairly tender cut of meat from the local range-fed cattle, which you would probably pay gourmet prices for in the U.S. .
In summary, my opinion is that if you want to try to maintain your lifestyle in the U.S. with all the latest gadgets, amenities, and service, there is no problem. These days, you will find most of what you are interested in available locally. But if living more cheaply is your desire, then you certainly can do that. You will have to make adjustments, and find your sources, but it is doable.