The ever-popular Vibe with manual transmission is the most fuel-efficient car on the MacPhee lot: city 7.9L/100km, highway 5.9L/100 km, for about $20 grand. If you're looking for a cargo van, ask about the GMC Savana Cargo, the most fuel efficient vehicle in its class according to Natural Resources Canada, with city 14.1L/100km and highway 10L/100km.