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i dont know if i missed it or not but did you start off with a fresh full tank?
since you only got it 2 days ago, remember other people with heavy foot might have test driven it and i know at dealers when checking out the cars they tend to leave it running.
Yes, it was a full tank when I bought the car. Not sure what kind of gas they put on. I heard that low quality gasoline could effect the mpg correct?
I have had my '08 GS 350 for about 10k now and get about 26 mpg with split driving, highway/city. If I am on a long trip using 80% plus highway I get closer to 30 mpg. Best ever was a drive to the beach with the car loaded up with family and a full trunk: 31 mpg after 3.5 hours of highway driving at average speeds of 70 to 80 mph. That's not bad for a V6.
Managed to smash this on the way to Vegas for my wife's birthday to see Steve Aoki & Tiesto at Hakassan! LOL. Figured to capture one for you guys to show MPG cruise set to 77 mph (pictured) for a GS430, first 100 miles though I set 27.5 when cruise was set at 68...(not picutured) What's cool is that by the time I got to my destination there, I WAS LEFT WITH HALF A TANK STILL!!! I was telling my wife I was mind-fawked seeing this for a V8. I drove my dads 2014 Avalon for kicks and within the same trip left me with a 1/4th left of gas so it's a huge diff for me and 3GS FTW. Another pics attached of myself on Left with my wife and my other two friends jacked up with Monster & Sky Vodka! WOOHOO!!!