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As ha been stated, it seems to differ vehicle to vehicle. Being from northern Alberta, Canada I drive some pretty wicked winter drives. Bran doesn't matter much as one is either plowing through mother nature's hatefulness or having to warm up vehicles constantly.
Summer driving though seems that brand does matter. My geo doesn't care. My 04 F150 does though! I can see a 2-4 mpg difference in different brands, and had logs to prove it until my smartphone landed in the pool. (Can't be very smart if it hasn't figured out how to swim....?) anyway like I said 2-4 mpg, all highway (same highway) and 500 km one way trips with cruise set at 110 km/hr. It was actually a lesser brand that made all the difference! I think they run a shell variant but can't say for certain.
If I am lucky enough to find a fill station that my vehicles like I cling to it!
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