I have a 2000 MGT, since I bought it (about 4 months ago) I have used just 87 octane. The car runs suberb. I get about 19 MPG mixed driving, and on my trips back home I'm getting around 23 MPG. However, I decieded for shats and giggles to put some 89 in the car. It *seemed* (maybe just a placebo) to have slightly better throttle response. The car, to me, felt like it was running better on 89. So, for the next 3 fill-ups I put in 89. My mileage dropped to 17 MPG mixed and 20 on my trips home. I was trying to drive as consistant as possible.
I decieded to try 93 octane. Didn't notice a difference drom the 89, milage remained about the same as with the 89. Only did that for 2 fill-ups, then went back to 87. I just filled up this morning with 89 again and the car feels smoother. Do the MGT's prefer 89? Anybody else noticing this with their car? Or, am I full of it? I swear though, this car feels more responsive with the 89.
(I know with my previous cars 93 was all I used, it even states in the manual and on the fuel door "premium fuel only." However, those were high compression motors; I thought the 4.6 was designed to run on 87.)
I decieded to try 93 octane. Didn't notice a difference drom the 89, milage remained about the same as with the 89. Only did that for 2 fill-ups, then went back to 87. I just filled up this morning with 89 again and the car feels smoother. Do the MGT's prefer 89? Anybody else noticing this with their car? Or, am I full of it? I swear though, this car feels more responsive with the 89.
(I know with my previous cars 93 was all I used, it even states in the manual and on the fuel door "premium fuel only." However, those were high compression motors; I thought the 4.6 was designed to run on 87.)