Depends on the age of your vehicle , if it is pre catalytic convertor then lrp may give slightly better mpg but a lot will depend on the condition of the engine mileage , serviceing etc , if your vehicle has a catalytic convertor then i would'nt recommend lrp as the unleaded burns cleaner , to get better mpg it's a good practise to use a fuel addative that covers the catalytic convertor as well as the injectors, valves etc , this will remove carbon build up and so improve the signals required from modern engines that are sent to the ecu , hope this helps
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