Next time you replace your tires, get the equivalent OEM tire size in the 16 inch rim, and watch your gas mileage come right back up.
The little problem is the ECU cannot compensate for the change in tire "over size" from the "factory original size".
This not only happens on Soobs, but on our Suki as well. We went from 14 inch rims to 15 inch rims with an over size tire, the mileage fell off immediately. Then we downsized the tire back to the OEM size but on the 15 inch rims and the gas mileage returned to the higher original efficiency.
Next time you replace your tires, get the equivalent OEM tire size in the 16 inch rim, and watch your gas mileage come right back up. The little problem is the ECU cannot compensate for the change in tire "over size" from the "factory original size". This not only happens on Soobs, but on our Suki as well. We went from 14 inch rims to 15 inch rims with an over size tire, the mileage fell off immediately. Then we downsized the tire back to the OEM size but on the 15 inch rims and the gas mileage returned to the higher original efficiency.