Related by context. Frequent words. (Click for all words.) 74 Fuel Economy 70 Fuel Efficient 70 Gas Mileage 65 Hybrid Cars 64 Fuel Consumption 63 CO2 Emissions 62 Hybrid Vehicle 62 Hybrid Vehicles 61 Greenhouse Gas Emissions 58 Hydrogen Fuel 58 Carbon Emissions 57 Stability Control 56 Greenhouse Gas 56 Reduce Emissions 56 Medium Duty 55 Auto Bailout 55 Hydrogen Fuel Cell 54 Carbon Offset 54 Emissions 54 Natural Gas Vehicles 54 Alternative Fuel 53 Improve Quality 53 Seat Belts 53 Lithium Ion Batteries 53 Diesel Engines 53 Emissions Reduction 53 Compact Car 52 Fuel Tank 52 Natural Gas Vehicle 52 Hybrid Concept 52 Cost Savings 51 Retrofits 51 #V MPFI DOHC 51 Jobless Benefits 51 Fuel Costs 51 Efficiency 51 Flex Fuel 51 #.#L V8 #V MPFI 51 Greenhouse Gases 51 Diesel Engine 51 Economy CAFE 51 Carbon Reduction 51 Zero Emissions 51 EPA SmartWay 51 Stimulus Spending 51 Wireless Carriers 51 Gasoline Prices 51 Improve Efficiency 51 Diesel Fuel 50 Electronic Stabilization 50 Ethanol Production 50 Electric Vehicle Charging 50 Lithium Ion Battery 50 Cut Costs 50 #.#L V8 #V 50 Million Gallons 50 mpg city/# highway 50 Tread Lightly 50 CAFE standards 49 #.#L V6 #V MPFI 49 Reduce Costs 49 Environmentally Friendly 49 Carbon Offsets 49 Air Bags 49 Achievable 49 Dual Fuel 49 Gas Prices 49 underinflated tires 49 Seat Belt 49 Autogas 49 Mileage 49 #.#L I4 #V MPFI 49 Help Small Businesses 49 Customer Retention 49 Energy Efficiency 49 Extended Warranty 49 Emission Reduction 48 Cost Cutting 48 fleetwide average 48 Provides Tips 48 Toyota Highlander Hybrid 48 Concept Car 48 Nissan Altima Hybrid 48 hydrogen internal combustion 48 Fossil Fuels 48 Zero Emission 48 Scrappage 48 Battery Powered 48 Toxic Chemicals 48 J.D. Power 48 Minivans 48 Automaker 48 FlexFuel 48 Tahoe Hybrid 47 Profitable Growth 47 FreedomCAR 47 Ad Spend 47 Increase Productivity 47 Alternative Fuels 47 ZEV 47 tailpipe emissions