By giving you a less precise fuel tank indicator (eg: 8 segment fuel display) versus xxx Miles of Range, your cajoled into trusting the estimator, and the range

By giving you a less precise fuel tank indicator (eg: 8 segment fuel display) versus xxx Miles of Range, your cajoled into trusting the estimator, and the range being so high on gas cars usually allows the estimator to end up closer to accurate thanks to bad and good economy driving and conditions averaging out.