The best advice is to always run the lowest octane recommended for your car by the manufacturer; in your case, that's premium fuel. In the case of a Shelby GT one has to wonder why you'd spend 35 large on a vehicle then try to save pocket change by using lower octane. How much will you save? Someone can check my math, but in my area premium is $0.20/gallon more than regular. If you get 18 MPG overall (not unreasonable) and drive 12,000 miles a year you'll save a whole $133 each year by burning regular. Not worth it to me--you make up your own mind.The Shelby GT requires premium fuel. Can I safely run 87 octane in the car to save on fuel cost?
I was thinking since they had knock sensors that the computer would pick up any pinging and would retard the timing.
What are your thoughts.
I put in regular 87 for my GT. I probably shouldn't but the gas price is too damn high. I would normally put in 89. She runs better on it I believe.
You know what else is weird, the other day i filled up with gas and the computer said i burned about 6 gal. of fuel. Well according to the pump i pumped like 7.8 gals. ............Something isn't jiving!!!!! Help guys! Whats going on? Is the pump just saying that so i can buy more gas?
Joe