Why is the same coffee taste better from a coffeeshop than homemade?

make sure your coffee grounds are finely grounded and packed as much as possible. it can also be perhaps your boiler is not hot enough. try adding a bit more coffee grounds for more flavor. ultimately, play around with the proportions. experiment.

I believe the biggest difference is going to be water temperature and time. I don't know the exact temperatures, but I understand that to get the best cup of coffee, your water should be within 5 - 10 degrees of a specific temperature, and the coffee grinds should only be in contact with the water for like 5 or 6 minutes. The commercial coffee machines that places like Dunkin' Donuts use are probably much more consistent and reliable than a home coffee machine. I'd suggest getting a coffee press, and heating up your own water. You can use a candy thermometer to be sure it's the right temperature before making your coffee. That's what I do (well not with a thermometer anymore) and I think it turns out greater than any drip coffee pot I've ever owned.