create a fuel table

I work with an ecu that displays data logged info in the following manner:

tps map A/F rpm
10 80 14 1500
15 90 15 900
20 89 13 3500
30 100 13 4500
35 101 12 5500
0 60 12 800
5 65 14 1200
9 80 12 1500
21 70 15 2300
23 78 14 2200

I want to create a 2D table. The vertical axis of the table would be the map values and the horizontal axis would be the rpm. Like so:

http://www.rbracing-rsr.com/fuelmapl.htm

What I would like to know is how I can create a formula that would search through the above table and average the A/F value of similar rpm and map, and tps values. An example would be the vertical axis is at 1200-1600 rpm, the map at 80-90, and the tps is from 0-10. The results can be both 12 and 14. So I'd likes to display the average of the two.

Any help would be greatly appreciated.

bump.......

So MAP goes in the left column, RPM in the top row - what goes in the body of the table?