Originally Posted by
Cobrajet
Costco gas is top-tier, so it is as good as any.
I usually run Arco (also top-tier), and sometimes notice a slight decrease in mpg versus Texaco or Chevron. My last tank was Chevron, and I did 51.8 mpg.
Most Arco tanks are in the the high 40s, but Chevron is about $0.30 more per gallon here so it is hard to justify buying it.
My best tank has been 53.1, but most are around 50-ish.
I use top tier also... today I got around 67 mpg to the tank. I got really surprised
__________________________________________
View my fuel log 2015 Mirage Intense 1.2 manual: 47.9 mpg (US) ... 20.4 km/L ... 4.9 L/100 km ... 57.6 mpg (Imp)