gas

I have a 2004 GMC Sierra 1500 that I have not hardly used at all over the last two years. It is my second vehicle. It has a check engine light and I am wondering if it could be from bad gas. Yesterday the check engine light was blinking but today it is steady. I rarely drive the truck and the...

What grade fuel do you put in your GMC? Just bought a 2011 Yukon Denali and on the gas cap it states E85 or Premium. I'm used to putting Premium 91 in my previous car but with the 6.2L burning up gas twice as quick as what I'm used to, I'm tempted to start pumping Regular 87. What are your...