1999 Ford Explorer

Greetings,

My brother is looking at purchasing a used 1999 Ford Explorer Sport, 4Dr,
2WD with the 4.0L V-6 and automatic tranny with 113,000 miles (approx.
20,000 miles per year). The truck looks very nice and runs well. The
seller is asking $5500.00 for an all-cash deal.

Questions:

1. Are there any issues with this particular model and year, or with this
motor and transmission that would make him decide against buying this truck?

2. This price is about $1000.00 to $2000.00 less than Kelly Blue Book price
(depending on how you rate the vehicle). Should he be suspicious of the
truck because the asking price is less than book value?

3. Assuming normal maintenance, what (if any) large ticket items would he
be looking at repairing or replacing on this vehicle due to the age, useage
or mileage?

4. What is a realistic average MPG for this truck?

Thanks in advance for any help or sage words of wisdom.

Cheers - Jonathan