re: How do you baws split expenses with the wife?

My wife and I (31 years together) have never had a combined account.

I pay Insurance/Phone/Satellite/Internet and my expenses (gas/lunch etc).

She pays Groceries, electricity/garbage and her expenses.

I rarely eat at home so groceries are minimal. Our house is rather small so electricity average is probably $120 per month.

I make about twice as much but I save the majority of my income (401k + investments).

I cover or share major expenses.
I paid for the house 100% (small but paid for).
She got a new car last year. I paid half and she paid half (cash)
We recently had a new roof which I paid for.
We share in the tax return 50/50 even though I pay about 75%.

I should point out that this works for us but may not for everyone. We do not have children which may be a major factor.