2000 Chevrolet S-10

Engine problem
2000 Chevy S-10 V6 Four Wheel Drive Automatic 120000 miles

I bought a newer truck and the gas mileage is very poor.
My old 1991 chevy S-10 4X4 with the 4.3 eng. Got 24 MPG. ( Manual transmission).
My new 2000 chevy S-10 4X4 with the 4.3 eng. Is getting only 14 MPG ! (This truck is a ZR2 version with an automatic transmission).
Other than driving habits, tire pressure, air filter, plugs-cap-rotor, what can I look for to cure this problem? MAF sensor? Transmission?

Thank's, Monte
Monte B
December 5, 2007.

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