Yesterday, we introduced the four fuel-sippers — a Chevrolet Tahoe Hybrid, Ford Escape Hybrid, Honda Civic Hybrid and Toyota Prius — we schlepped through Chicago traffic early this month. We took pains to drive as we normally would: No nursing the gas pedal to stay in electric mode or purposely coasting to regenerate more braking energy. Just ordinary stop-and-go driving. Faced with some wonky fill-up numbers at a gas pump on the fritz, we took our results from each vehicle’s onboard mileage readout, which we reset at the beginning of each new leg. Read below for the numbers, along with some postgame analysis.