Power inverters help us to get stable electricity but the question is whether using them cuts electricity cost or not. Power inverters are good as power backup devices for stable electricity and for convenience.
A bad wheel alignment causes a car not to track straight and it has other detrimental effects. It is caused by potholes, bumps, worn suspension and steering components and other kinds of impact on the wheels.
The choice of the use of synthetic or mineral engine oil is also a choice between long term cost saving and short term cost saving on servicing. It is more cost saving to use synthetic oil since it has longer oil change interval.