horsepower & mileage glitch?

[Skygrasper550]

First of all, what's odd in GT mode is that when you go on Practice in one of the tracks, you spend one game day. But you don't spend any game days at all when you practice in courses you have from Course Maker.

Since I'm a car collector, to avoid wasting game days I tune my cars and test them in Arcade Mode. I have some tracks I got from Course Maker but they aren't good enough. I have some tuned supercars but I'll cite my brand new Murcielago LP 640 with some 45 miles dialed in, for my example.

I did some runs in the Nordschleife and changed a few suspension settings in my car, and after gaining some 16+ miles obviously my Murcielago's engine power would increase a bit, from 813 to 816. Now, when I got back to GT Mode and checked my garage, my car's power went back to 813 and my mileage was left untouched but the changes I made to the suspension were still there I was like "WTF?"

anyone in here who has an explanation to this?

 

[F1]

The game doesn't count milage in arcade. For you to get the horsepower, you would have to add miles to your car in GT Mode.