Just a bum tank of fuel. It has happened to me when I filled up at a smalle low traffic Valero. The next tankmof chevron mileage was right back up. I use Valero, Costco, or chevron/Texaco based upon my location.
I use both gas and also chevron and sometimes 76 and nothing else. A while back I found out Costco is now top tier and started using it.
If I had to choose one I would pick Shell over Costco but I doubt that they are that much different.
Shell has a good additive like Techron in Chevron. My top 2 choices ...
3 days ago I got 92 octane at Costco for $2.99 per gallon.
Tonight wife got 92 at shell for $3.77 per gallon. We were in a small town maybe why!
Haven't noticed huge mpg differences. If any, i get better mpg with Chevron & Shell than Costco but don't have enough data to back it up!
When I go down to Green Bay I'll fill with E093 V-Power shortly after I find myself pushing the turbo to hear the snarls confirming my effort in a positive way...fuel mileage? so what, it's always been great.
Originally Posted by Garak
Claims of 10% better fuel economy simply by switching brands of gasoline is going to bring out a few pointed questions, for obvious reasons.
Just like changing to a 0w something is going to but you'd have a better chance with different gas.