CNG vs LPG conversions: which pays back faster for a high-mileage driver?

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Is a hydrogen fuel cell car cheaper to run than a petrol one? Why does my car's mpg fall so far in winter? What does a 700 horsepower muscle car really cost to run each month? Real cost per mile: electric car vs hybrid vs petrol SUV fuel bills compared with the sedan they replaced Why does the same car get wildly different mpg for two drivers? Do plug-in hybrids save money if the owner never plugs them in? Do hydrogen fuel cell cars follow the same maintenance schedule as petrol cars? Hypermiling habits that actually move the needle on a daily commute Working out your true fuel cost per mile from pump receipts