Convert Text to Table In a comparison of Ford Conventional vehicles and hybrid electric vehicles (HEV) the HEV proved to have a greater range (450-550 miles) than did the conventional vehicle (350 miles). And, as might be expected, these numbers were the same for gasoline range. In terms of economy, the HEV was 30-50% better than the conventional vehicle. This in turn, meant less frequent fill-ups for the HEV. Burning less gasoline causes the HEV to be 95% cleaner-far friendlier to the environment. And finally, this study found that the HEV performed more like a V-6 (more powerfully) than the conventional vehicle, whose performance was considered more like that of a 4-cylinder engine.