I have one of the '99 7.3's with over 200K miles on it.
It gets 19.5 mpg on every tank, when not pulling.
It drops to around 14 or 15 mpg depending on the load weight.
There were 2 '99 models, one in '98 and one in '99.
They called them '99 and '99 1/2 models. Not sure what the difference is.
I bought mine in April of '98.
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