I've had two friends with Granadas over the years and both of them affectionatly called them "The GrenadeA" lol. The first was an Army buddies while I was stationed in El Paso. It was a 1977 four door if memory serves be correctly. While it drove incredibly smooth, anytime he hit the gas pedal to pass somebody the poor engine would rev-up, but do nothing. I don't recall what engine he had but a quick google search tells me it was likely one of the aptly named
Thriftpower I-6's. The second is a current co-worker of mine at Ford. It's a 1978 2-door with a 302 engine. It used to be his daily driver until he spun out in the ice. Now he only drives it in the summer and is in the process of fully restoring it. Somehow he managed to keep it rust free here in Michigan.
Edit: Ironically both were brown, like yours. Did they even make another color? (OK now I'm picking)