I recently purchased a 1996 XJ with 120k miles. The thing looks, runs, and drives like new.
When I purchased it I filled it with 16.3 gal of 91. I drove it 328 miles then filled it with 16.2 gallons of 87 after reading here that 91 is not needed. I got 278 miles out of the tank?
I filled it with 15.9 gallons of 91 again. And today my odometer reads 306 and my gas light is still off.
So...
I get on average 20.1 MPG with 91 octane, and 17.1 with 87 octane. It's cheaper to pay 2.00$ more per tank! No matter the price of gas...At least for my rig.
When I purchased it I filled it with 16.3 gal of 91. I drove it 328 miles then filled it with 16.2 gallons of 87 after reading here that 91 is not needed. I got 278 miles out of the tank?
I filled it with 15.9 gallons of 91 again. And today my odometer reads 306 and my gas light is still off.
So...
I get on average 20.1 MPG with 91 octane, and 17.1 with 87 octane. It's cheaper to pay 2.00$ more per tank! No matter the price of gas...At least for my rig.