I concur regarding raised tire pressures. I've done the last tank with pressures ALMOST per Toyota spec.: dropped from around 38 to 34 psi. We have the low profile optional tire size, 215/45R17. They're harder ride at any pressure. Tanks have been coming in at 4.6~4.7 (liters per 100 km, calculated). The drop in tire pressure: I went from 4.6 to 4.7, which could be vagaries of the driving conditions, as much as anything. I'm concerned too: the tires, in absorbing some shocks, are lessening the stress on the car's suspension.