Venchurs Vehicle Systems says one of its converted compressed natural gas (CNG) bi-fuel Ford F-350 pickup trucks was recently pitted against a Volkswagen Passat TDI and a BMW 5-Series on the History Channel's "Top Gear" program to determine which vehicle offered the best fuel economy.

The episode, which will re-air on Thurs., Sept. 13, at 11:00 p.m. Eastern, was dubbed "One Tank." The show's hosts were required to drive from Portland, Ore., to San Francisco without stopping for fuel.

Venchurs, which is keeping the results of the match-up close to its chest, commented only that the CNG bi-fuel truck "performed extremely well in the test, highlighting its long-range capabilities and the seamless transition from CNG to gasoline operation."

Want to see how it all played out? Click HERE.

"I'd say landing a prime-time segment on 'Top Gear,' where our CNG F-350 competed against highly efficient German gasoline and diesel cars, proves that CNG is viable," adds Jeff Wyatt, CEO of Venchurs.

The Michigan-based company is a Ford Motor Co. Qualified Vehicle Modifier (QVM) that offers both dedicated CNG and bi-fuel upfitted conversion systems for Ford F-250s and F-350s.