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Yes they do!!! It is called "blending". Not all midgrades are a blend though. Originally, each product had a dedicated storage tank and pumped a specific grade or octane. Currently, some of these systems still exist and are termed "straight" meters. A majority of the fuel dispensers now only have two octane storage tanks, typically 87 & 92/93. When you select 89 for example the pump electronically determines the proper mix or "blend", (if its working correctly). It may mix 70% 87 and 30 % 93 for example to arrive at 89. However, this is a progamable function and this ratio is adjustable. I generally only buy midgrade from a straight meter. On the blends I buy only low grade or high grade, which functions as straight meter delivery. On the subject of octane. "Most" , (47) , states have some form of a fuel quality program to monitor fuel octane etc. Currently (3) do not. Pennsylvania, Utah & Alaska. Why these (3) do not feel the need to monitor the quality of their fuel being sold to their taxpayers is a good question? I guess oil companies need somewhere to unload their questionable product? Pennsylvania lawmakers, for example, have been quoted as saying there is no evidence of a need to monitor fuel quality. Coincidentally, Pennsylvania pays the highest fuel taxes in the nation and is the 7th largest user of gasoline in the nation. Certainly for the consumers of Pennsylvania in particular this should be raising a few eyebrows. Apparently gasoline producers and sellers in Pennsylvania have earned the trust of the legislature in order for them to feel comfortable enough to look the other way when it comes to performing this function. Or, it could be that all the taxpayers in the (47) other states with a program are just wasting your money.

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Q: Do gas stations mix 87 octane and 91 octane at the pump to make 89 octane?
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