Guest Gus Reiber Posted November 15, 2012 Share Posted November 15, 2012 Hey all, So I am the owner of a Certified Pre-owned 2007 Hybrid Highlander. As my car crossed the 50k mile marker, my fuel economy dropped off by about 20% and has continued to decline. I have brought it into the dealer but their tests did not reveal any problems. I suspect very strongly that the hybrid batteries have begun to loose their potency. My local dealer has no additional diagnostics beyond a red-light, green light test. Has anyone out there replaced their hybrid batteries, diagnosed them or seen similar fall-offs in economy? Thanks for your help. Quote Link to comment Share on other sites More sharing options...
Hiemedall Posted February 22, 2013 Share Posted February 22, 2013 Hey Gus... I'm Doug... I too have a 2007 Highland Hybrid.. Over the last 2.5 to 3 years I too have seen a decline in mileage economy.. My all time high on a combined city and highway driving was 36 mpg on a full tank..... It has consistently been ebbing to now around 25 mpg.. still good.. but no where I use to be.. I was afraid my fall off occured when I started using Synthetic oil, but the dealer says that should have no issue... I have noticed the I.C. engine kicks in a lot quicker than it use to.. Maybe someone else out there can help us... Regards, Doug Quote Link to comment Share on other sites More sharing options...
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