I just received an email from Exxon Mobil where you can save 15 cents per gallon when using your Speedpass when you fill up for the next 60 days or 100 gallons, whichever comes first. You will not see the savings at the pump, however will get a credit on your card as one lump sum on gas that you used the speedpass for. It should appear when you reach 100 gallons or after 60 days, whichever comes first. Check out their Promotion FAQ for more details.
Just sign up for the promotion at the Exxon Mobile Speedpass site. You need to register an online account with them if you haven’t done so already.
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You figure with current gas prices at around $4. Getting $.15 gallon off is like saving 3.75% at the pump. Not a lot, but at least you can brag to your friends that you only paid 3.85 for gas while they still paid $4!!!