Is there much difference in the quality between off-brand cheap gas and premium fuel from major gasoline companies?
Stop worrying about using cheap gas. Most experts say it's not likely to hurt your vehicle at all. All gas is pretty much the same product when you break it down. What makes expensive gas more expensive is NOT the quality, but the additional additives added to it. Additives are said to provide additional engine protection to your car. Expensive gas, simply means there are more additives within a particular grade of fuel and this is what makes it more expensive. So in my humble opinion, the answer is NO, cheaper gas should not harm your car.