Some rough math based on https://www.aircraft-commerce.com/wp-content/uploads/aircraft-commerce-docs/Aircraft%20guides/DASH%208%20&%20Q%20SERIES/ISSUE63_DASH8FUEL.pdf suggests a Dash-8 100 series aircraft (similar passenger capacity turboprop plane) would burn something like 57 gallons on a 27 minute flight, assuming $4/gal results in $228 fuel cost