Sitting at 12.7 is 50/50 highway/stop start with a average speed of 49. Heckk Ive owned commodores all my life abbafan, from vh,vn,vl,vt,vx. Its not im wanting fuel economy but if an ecotec/alloytech could show an improvement over a l67 ild probably go back to the ecotec as my life of enjoying...