Distance to empty is a simple estimate based on previous fuel economy and driving habits. Losing 2PSI in the tires will screw that estimate easily. Check your tire pressure. If you're truly worried about it - calculate your actual fuel economy (Miles driven per tank divided by amount of fuel that it took to get to full tank again) and compare your actual fuel economy to what other Santa Fe owners get with same engine and drivetrain on "Fuelly.com" If your true MPG is same as others, then you're stressing over nothing.
"Based on data from 79 vehicles, 6,479 fuel-ups and 1,766,898 miles of driving, the 2015 Hyundai Santa Fe gets a combined Avg MPG of 20.43 with a 0.09 MPG margin of error."
"Based on data from 79 vehicles, 6,479 fuel-ups and 1,766,898 miles of driving, the 2015 Hyundai Santa Fe gets a combined Avg MPG of 20.43 with a 0.09 MPG margin of error."
2015 Hyundai Santa Fe MPG - Actual MPG from 79 2015 Hyundai Santa Fe owners
The most accurate 2015 Hyundai Santa12ves MPG estimates based on real world results of 1.8 million miles driven in 79 Hyundai Santa12ves
www.fuelly.com