Is it possible to be above average in expenses and in savings for a given income? We are saving over $50,000/yr, since our tax rate is fairly low (lots of tax deductions).
I think so, yes. The monthly expenditure calculator doesn't include taxes, so it won't correlate with savings difference between someone who pays a ton in taxes and someone who's a savvy tax planner.
And as arebelspy points out..
... they underestimate their spending by missing large one-off irregularly occurring items (whereas on the earnings side, they'd probably add in a bonus, if they had one, to their annual income, as that's easier, versus dividing by 12 and adding it to the monthly).
So you could have Person A and B reporting $100k in income and $3,000/month expenses, but Person B saves much more than Person A. When Person A reports $3,000/mo, they aren't calculating all of their lumpy or unexpected expenses throughout the year--medical bills, vet bill, home repair, car repair, even regular but non-monthly bills--and they actually spend about $8,000/year more than they report. They also don't do any tax planning, so they end up paying close to $30k in taxes every year, leaving them with something like $26k to save/invest.
When Person B reports $3,000/mo, they're reporting their yearly expenses of $36,000 divided by 12, so they're accounting for their lumpy expenses. They also go out of their way to minimize their tax burden, so they only pay about $12k in taxes when all is said and done. That leaves them with $52k to save/invest, twice what Person A saves.