I have a 4.4 and usually at 4.4 in NYC. Now I work in LI, all highway and i'm up to 15.6mpg.

I am going to replace O2 sensors, already replaced air filter.. Gas is at 3.70 here premium 93.

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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2