My 2000 civic ex auto is not getting the same mpgs it use to. I use to get 33 to 38 now I'm down to 28 to as bad as 25 at times! Most of my driving is hwy but living in Atlanta speeds are either stopped or 80+mph to not get run over! I have not been using the a.c much. It had a recent tune up and the tires are at 48psi. I don't full throttle it and it never sees over 3500rpm. And tips?
silversol 
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