I work with quite a few people in retirement so I have to help them consider this stuff often. The common mistake people make is using a Gov projection of 2 -3 % inflation to calculate if they are likely to run out of money or not after 30 years of retirement. Now it's a 40 year projection in many cases and the  Gov numbers were never accurate in the 1st place and they are much  less so now. This is how the middle class gets annihilated. Most American citizens, if they live long enough, will spend their final years almost completely dependent on the Gov. Because...math.

*If you run out of money, you were never really middle class to start with. The Gov champions the notion that most of us are middle class to encourage current consumption.