See I've never found this in 4th in the civic, but if I am in 3rd, a slight touch of the throttle can take you from 30-33 quite easily.A rule of thumb I was told on a driver improvement course (bad Richierich) was 2nd - 20mph, 3rd - 30mph, 4th - 40mph. In most cars the revs at those speed are not too high to deafen, but you get sufficient engine braking if you lift off. The guy who told me reckons most accidental speeding in 30mph zones comes from people being in 4th gear and the car can run away slightly
I use 5th in a 30 - Petrol, better for the economy.So, just to clarify, for petrol
3rd feels more "correct" at 30mph, but I occasionally use 4th as slight variations in speed 28-31mph are more easier to do on the throttle (more travel).
All indicated speeds, btw.