Here's an update on my current tank in the Highlander. I took the pic on my phone just before leaving for work this morning. In contrast to my last tank in the Civic, I am not driving any "extra" miles. I drive the HiHy to work during the weekdays and then do any other necessary commuting from there. From home, I use the Civic whenever it is available.

I had the fuel economy up to 40.6 mpg last Friday, but I did an engine block heater install on Saturday. After driving around afterwards to make sure the air was removed from the coolant system, I managed to drop the fuel economy down to 39.6 mpg. (I drove a little harder than normal.)