And no, they don't affect fuel economy.
Sounds like the rear shocks are squeaking.
Bad socks replace all at the same time mounts as well this is most likely the problem all for because if you hear it on back the front were put on at the same time they should be replace every 50000 mile helps with gas as well as premature tire wear and handling
In all seriousness it isn't deadly but you just need the suspension looked most likely just ur springs
I just replaced the breaks, rooters, coolant fan and water pump in my sons car. We just noticed the rear of th car squeaks when you push up and down. Should we be immediately concerned? It is a saturn sc2