Quote:
Originally Posted by CamaroSSforme
Myths are hard to overcome. You can run regular just fine with the only consequence being slightly worse mileage, and slightly less power. You'd have to find out if the economics of it are worth it by testing how far your mileage drops when using regular versus the premium you pay for premium gas, then weigh in the performance drop. Also, you aren't going to hurt anything by mixing it up - doing premium, then mid-grade etc.
I currently have a premium only turbo, and can still mix it up. The LS3 is a premium recommended, not premium only (which is just "even more recommended"), so should be no reason other than those I listed for not using regular if you so chose.
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You definitely hit the nail on the head about mixing grades of fuel. In case anyone is wondering gas stations don't have mid grade tanks, they just mix premium and low grade fuel to get mid grade.
Although running an engine on too low a grade of fuel can cause problems and severe ones at that. You won't find low grade enough fuel in north america, you have to travel to find those types of fuel.