Gas Mileage

[Cameron Symonds]

I have an interesting observation:



When I gas up at Mobil gas stations, I get 17mpg. (avg over 3 tanks)

When I gas up at non-Mobil gas stations, I get 19-20 mpg. (again, avg over 3 tanks)



I do a lot of driving, 1k miles/week. Has anyone else experienced this? I live in the northeast, the gas contains 10% ethanol. Could be the different Mobil additives and detergents?



I know I'm going to get flamed over this post...maybe someone else wants to try this in their Trac.

 

[Bret Pardew]

I pretty much get 18 mpg with my driving, any station. When I was going from Maryland to Texas I averaged 22 mpg, again, wide variety of fuels. Currently I live in Texas and use fuel from Savon gas stations, not sure what that mix is other than grade 89..



Bret

 

[Richard L]

It is possible that some brands of gasoline may give slightly better or worse mileage than other brands due to the % of eythanol alcohol present in the gas formula. Eythanol gets about 20% less mileage than regular gasoline but it is used to inexpensively boost the octane rating of gas. That would only account for a very small difference in mileage. Perhaps only 0.5 MPG at the most. No way it would make a difference of 2-3 MPG.



I suspect that you may not be calculating your actual mileage correctly or it's just a coincidence that you ran into heavier traffic when you used Mobil.



...Rich

 

[Chet 02]

Are you using the same Mobil station? I'm sure you already thought of this but I have experienced of couple staions I've used having incorrect calibration on their pumps. One time I even managed to pump 24.3 gallons of gas into my 22.5 gal tank. :blink:



Chet