The math
(1,000 ÷ MPG) × gas price. For 28 MPG at $3.45: $123. Add ~10% for hills, headwinds and AC use.
Real road-trip examples
Most US coast-to-coast trips are 2,500–3,000 miles. A 1,000-mile leg is roughly LA → Denver, Chicago → Dallas, or Miami → Washington DC. Plan your exact trip with the Trip Cost Calculator.