Taxi fleets typically do nothing but short trips in urban areas, and sit with the A/C or heat running while waiting for a fare. This is where a hybrid will shine. Gasoline vehicles use a substantial amount of fuel in stop and go driving, and while just sitting idling (not to mention wear and tear on the engine). A hybrid uses nothing but electric to operate the A/C and heating systems while sitting "idle", and (as previously mentioned), the regenerative braking charging function is most effective in stop and go driving. So, yes, a hybrid is a good option over a big old V-8 Crown Vic sitting in front of the hotel or convention center.idling, and then going 6 blocks light to light in downtown traffic.