I think that depends on the engine. My mom has a 93 toyota Camry 4 Cylinder, and my dad has a 98 Toyota Camry. Hehe, we are actually a Camry family, but I am the only one right now with a Honda. My bro also had one but he got in into an accident and now he drives a toyota Celica. Anyway, my mom, since she has a 4 cyclinder engine in her car, she uses 87. My dad however, always uses 89 or 91. My bro, being a sports enthusiast, always goes for the 91, because he likes to show off. hehe. Oh and I use 87 cause my car is only 4 cylinder. My dad has 6 cylinder (his is V6 engine). And SUVs probably go with 91 or 89 because they have 8 cylinder.