To be honest I've never looked at my 2002 Suburan data (see fuelly for an E85 and an E10 log but E10 has some huge advanages with early ownership long trips) to see if I happened to have a seasonal favorite. My XFE quotes above had all 4 tire changes per seasons. Probably worth a good portion of the 10% "seasonal" swing.
The best data I've collected is probably with the Stratus back when it was my primary car, cruise control, auto, only eco driving was a little bit of neutral coasting. It followed the energy curve almost perfectly. My newer FFV cars don't, they do better.
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