Weird Inflation Phenomena?

Two observations:

1. Fast food chains have been increasing the size (and price) of the high-margin portion of meals (fries and soda) while keeping the low-margin portion the same
2. The price differential between 87 and 89 octane gas has gone way up at many gas stations in my area (Silicon Valley), but the differential between 89 and 91 are the same as they used to be.

I'm wondering if #2 is being caused at least in part by GasBuddy.com, since they only list the price of regular gas. #1 appears to me to be a way to increase prices without consumers' noticing.

Comments?

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I wish they had a combo

I wish they had a combo option to increase the fries size without increasing the drink size.

Well, at this point combos

Well, at this point combos are just for ordering convenience. You don't actually save any money by ordering them versus ordering each part separately, at least in most cases. The fast food joints have people trained so they don't need the discount any more. So just order a small drink and large fries.

What's truly amazing is that

What's truly amazing is that you can get a double cheeseburger at McDonald's for $.99 while a single cheeseburger costs $1.09. That extra patty of beef costs -$.10!

The best way to try and sort

The best way to try and sort this out is to get a state by state listing of boutique fuels. Not all states have all octanes and they certainly do not have all of the same additives. It could be that one of the ones you mentioned is CA specific while the others are not and the cost of transporting it is not offset by sales in other states.

I believe all gasoline in CA

I believe all gasoline in CA is specific to CA. For a very long time the 89 has been 10c more than 87 and 91 has been 10c more than 89. Now it's still 10c between 89 and 91 but more like 20c between 87 and 89.

Another possibility is that people who use higher octane gas are simply less sensitive to gas prices or that fewer gas stations advertise their prices for premium gas.

I'm at least glad that one of my premium-gas-requiring vehicles gets 35 mpg :)