Since I haven't heard of anyone complaining about this lately I'm guessing everyone's is improving.
My 350 went from averaging 22mpg to 24mpg with about 50/50 freeway/city split. This is driving either in Sport or Normal mode or both with a few romps each tank. No attempt to better the average, just normal driving.
This last tank was 25.4mpg but the After Refuel gauge said 24.3mpg. The last few tanks my gauge was only off by 0.3 but this tank it was off by 1.1. Got 369 miles on the tank and the low fuel light didn't even come on. This tank was mostly Normal mode. Still had some romps, like to shake off the grasshopper swarm that has this town under siege right now.
I'm just shy of 5K on the clock. My driving mix is about 70% city 30% freeway, and I'm averaging a little over 20 mpg, most of it in sport + mode. In a recent 1000 mile road trip, I averaged 25 mpg (in eco mode). Seeing what others are experiencing, it's not too bad. OTOH, Honda's new V6, which almost as powerful as Toyota's 3.5, gets 21mpg City/ 34 mpg highway on regular fuel. Honda does this through cylinder deactivation (at speed).
I think most of us agree the IS 350 needs more grunt, but one would hope that without it, the compensating virtue would be better gas mileage. Toyota's V6 is refined, but it's a dated engine in terms of both performance and mileage.
2014 IS 350 F Sport, Nebula/Rioja, RWD, BSM, Nav
2013 Mustang GT Premium, Deep Impact Blue, 6MT
3.73 gears, Boss 302S wheels,
255-40-19 Michelin Pilot Super Sports,
Bama 91 Octane Race Tune
I filled up today after almost 1 month and got 21.7 mpg. This is one of the worst mpg's I ever had.
Not much highway, mostly city driving and even if I was on the highway was stuck in traffic.
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2009 Blue Sensation Pearl Honda Fit Sport 12/2008-Present
1998 Cayenne Red Pearl Acura Integra GS 07/01-12/01 (Stolen)
1999 Milano Red Acura Integra LS 12/02-12-08 (Totalled)
2000 Milano Red Acura Integra GS 07/10-08/13 (Sold)
Just with the weather getting better, every car should have naturally improved.
You guys with abysmal gas mileage must drive in some extremely thick city driving most of the time. Do you drive with the A/C blowing full blast 100% of the time too? I try to keep my AC with 1-2 bars of fan speed. But after living in DC I can see how driving in thick city traffic in a high humid climate (less oxygen for the engine) is going to severely decrease fuel economy.
There is always Tesla! ...or the i8 if you have the money.