Related by context. Frequent words. (Click for all words.) 72 CAFE standards 59 Average Fuel 55 tailpipe emissions 53 CAFE 52 Fuel Economy 52 alternative fuels 49 mpg 49 mileage 49 gas guzzler 48 emissions 48 Automakers 48 diesels 47 gas guzzling 47 greenhouse gas emission 47 renewable fuels 47 greenhouse emissions 47 efficiency 47 CO2 emissions 47 Waxman Markey 46 gas guzzlers 46 carbon emissions 46 reducing carbon emissions 46 gas guzzling vehicles 46 emission 46 carbon dioxide emissions 46 automakers 46 greenhouse gas emissions 46 cleaner fuels 45 CO2 emission 45 gas guzzling SUVs 45 exhaust emissions 45 mandates 45 corn ethanol 45 hybrids 45 reduce carbon emissions 45 carmakers 44 carbon emitting 44 SUVs 44 biofuels 44 carbon dioxide emission 44 Renewable Fuel 43 emission reductions 43 carbon emission 43 standards 43 greenhouse gasses 43 GHGs 43 regulations 43 greenhouse gas 43 scrappage 42 emission norms 42 emission reduction 42 fuel 42 Carmakers 42 windfall profits 42 carbon dioxide CO2 emissions 42 greenhouse gases 42 diesel powered 42 gas guzzling cars 42 diesel 42 PAYGO 42 reducing CO2 emissions 42 EVs 42 alternative energies 42 ethanol blends 41 regs 41 internal combustion engine 41 automobiles 41 fleets 41 taxes 41 regulate greenhouse gases 41 internal combustion engines 41 CARB 41 mandating 40 hydrogen powered 40 flex fuel 40 Emissions 40 GHG emissions 40 tax 40 particulate emissions 40 fossil fuels 40 global warming 40 biofuel 40 hydrogen fuel 40 CO2 40 fossil fuel 40 greenhouse gas GHG emissions 40 excise tax 40 NOx emissions 40 Clean Air 40 tailpipe 40 GHG 39 reduce greenhouse gas 39 Ford Escape Hybrid 39 PHEVs 39 Kyoto accord 39 Chevy Volt 39 legislation 39 Escape Hybrid 39 cleaner burning 39 electric hybrids 39 zero emission