I would bet 29.1 mpg(US) is attainable. The 26's I've got will have been at higher speed Highway driving, like 115kph average. If I set out to gently drive 80-90kph, that's the sweet spot for better fuel economy and with super gentle acceleration and no traffic, it's only about 10% better than I've done without even trying.

 

Why don't you show us, make a quick video. Go get some gas and YouTube it. I have a good feeling about this, many such cases!

 

I'm already living an AWD fantasy achieving 26.1 so I don't want to deny whatever fantasy it is that you're having.
By yourself.

 

Wife took a trip to Savannah, GA to see the kids. 2010 FWD. 19in factory wheels with 55 series Michelin. Less than 115k miles. Cruise set at 70mph. A bit of traffic in the Atlanta area but otherwise smooth sailing. Some around town driving while there but not much. Filled when departing. Filled at destination. Filled again close to home. Close to 800 miles altogether. Wife uses the higher octane gas. 26.5mpg as measured by odometer miles traveled and actual gallons pumped.

 

on HW 100km/h