I have a 2006 ford crown Victoria and it gives me around 15city / 22highway mpg. And I was just asking does chevron Supreme gas give better gas millage because am not worried about the highway millage 22-24 is good. It's just the city 15 thats the problem, how can I get better city millage? Btw my brother pumps supreme chevron in a 2005 Honda civic hybrid and it gives him 35city / 40hwy instead of 32city/ 35hwy.
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