Originally Posted By: ATex7239
87 octane isn't going anywhere, any more than non-TT gas has gone by the wayside due to more and more manufacturers requiring TT gasoline. If people will buy it, people will sell it.
I've seen countless people pumping 87 discount gas into luxury and/or high performance vehicles, which I know spec high-test TT fuel.
People on here care about oil and gas variants. But, most folks wait for the gas light or change oil light to come on, then fill it up with discount gas and bulk oil from the service station. Continuing on about their day without a second thought to it.
Modern engine management means nothing bad will really happen. Maybe they don't have much of a butt dyno, but in the end it's not that big a deal especially for someone who doesn't drive a car hard.
In some cases it doesn't make financial sense given price differences between 87 and 91. Obviously it allows for better fuel economy relative to the volume of fuel. I just filled up at a local Costco where premium was $2.999 and regular was $2.799/gallon. If the premium results in 10% better fuel economy, then it actually makes sense to use it solely for fuel economy. However, most people don't have enough information to know if it really does.