300E Gas Mileage?

[Stubman]

I have a 91 300E 4Matic. 6Cyl petrol. It's cold up here in MN. I'm getting about 14.5 miles to the gallon. The specs I have read say I should be getting 16.5 MPG. Since buying the car I have put new O.E.M (Bosch/MB) wires, plugs, Distributor Cap and Rotor. I use 90 or 92 Octane gas. What should one expect as far as Gas Milaege with a 300E 4Matic (AWD)?????? Other wise it appears to run great. Any recommendation welcomed.....

It appears from the GAS mileage post I (thanks to all) I found that 4matics get 2-3 MPG less and the cold grabs a few MPGS along with slow in traffic driving. Along, with having fun 4 wheeling through adverse snowy conditions. My mileage still is on the low side of the post I've seen.