How Many Calories .... in Sunflower Seeds?

As of the time you read this, I will be on the open road, travelling around 850 miles across country to visit friends. Since I'm spending a large amount of time in the car, I'm going to need some snacks. One of my favourites -- in the summer especially -- is sunflower seeds. It's not just that they're tasty, it's the whole experience of eating them that I enjoy -- It requires concentration, yet it's still pretty mindless. I can eat sunflower seeds constantly while in the car, which is why I probably shouldn't. I heard they were fairly high in calories but I've never actually looked in to it. Well, I am now.

How many calories does 100g of sunflower seeds have?

A) 80 cal
B) 220 cal
C) 385 cal
D) 585 cal

The answer is D) 585 cal, according to this.

In addition, there's 48 g of fat in there too! All that for a snack that is ultimately not filling at all. Looks like I'll have to pack some fruit for my road trips, baseball games, etc. from now on.