Maybe the garage should specify which ratings you should enter. I entered the "new" ratings for my vehicles without any customized settings (your percentage highway/city affects the combined number if you save your customizations). Personally I felt slightly disingenuous doing this because I typically felt the "old" ratings were fair and accurate for my vehicles and it even wasn't hard to best the highway rating on a combined tank, but the web site seems intent on pushing the MY2008 ratings so I used them. Besides, on new vehicles the "old" ratings are no longer available. I wish they were, or that the new ratings only applied to certain vehicles (ahem...hybrids) and not others (diesels).
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