Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Do different Gas Brands burn more efficiently? Higher MPG's?

Eddai76 · 05-19-2016, 12:40 PM

I have a very routine, lengthy commute m-f with 60 miles of straight highway driving each way. I drive a 2014 Ford Focus SE Hatch. I've always used shell 87 in this car and was steadily getting 38 MPG per tank. I decided to try Unocal 76 87 octane since I used them years ago. I started getting 42 mpg per tank. I continued to use Unocal 76 for a long while and continuosly got over 40 mpg per tank. I recently switched back to Shell 87 Octane just out of curiosity. Sure enough mpg dropped down to 37mpg?! There is clearly a difference between Shell 87 octane and Unocal 76 87 octane. I drive the same route everyday, at the same times, with cruise control set at 70, and used each brand of gas consistently for weeks at a time for comparison. I'm confident the differences are due to the fuel.

05-19-2016, 12:40 PM	#25 (permalink)
Eddai76 EcoModding Lurker Join Date: May 2016 Location: Lancaster, CA Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Shell vs. Unocal 76 I have a very routine, lengthy commute m-f with 60 miles of straight highway driving each way. I drive a 2014 Ford Focus SE Hatch. I've always used shell 87 in this car and was steadily getting 38 MPG per tank. I decided to try Unocal 76 87 octane since I used them years ago. I started getting 42 mpg per tank. I continued to use Unocal 76 for a long while and continuosly got over 40 mpg per tank. I recently switched back to Shell 87 Octane just out of curiosity. Sure enough mpg dropped down to 37mpg?! There is clearly a difference between Shell 87 octane and Unocal 76 87 octane. I drive the same route everyday, at the same times, with cruise control set at 70, and used each brand of gas consistently for weeks at a time for comparison. I'm confident the differences are due to the fuel.