I have a 1999 Toyota Corolla, which has a D, 2, and L gear. I also have a steep driveway to climb everyday. Which of these gears is most appropriate for going up steep inclines?
Assuming that you have no faults with your transmission, it doesn't matter - an automatic transmission will automatically switch down gear as and when it needs to. All the '2' gear does is not let you go over 2nd gear - which if you were heading downhill could make your engine over-rev...generally not recommended.
So D should be just fine.
If you're carrying a high load, L is best.
The gears work as follows: D = use whichever gear the computer decides/ Useful for everyday driving. 2 = use first or second, depending on speed. Useful when carrying high loads at low speeds. L = stay in the lowest gear. Best for carrying high loads up steep inclines.