On the GTP account, I collected my 1,000,000 Cr. for the now-expired time trial, then rented a mule for the new one. After 20 laps, I got it down to 33.2.
For some more credits, mileage, and a 4-star marathon ticket bearing a Genesis X GR3 (a car I didn't already have on this account), I took the Ferrari FXX K to Sardegna. That allowed me to get half the remaining Gr.4 cars - the Genesis G70, Hyundai Genesis, Lexus RC F, Mazda Atenza, and Mitsubishi Lancer. That brings me down to under 100 cars to buy and under 88,000,000 Cr. needed to buy them.
On the Plus account, I took the Porsche 911 RSR to Sardegna. It is quite neutral in handling, will do 6 laps on fuel, can probably do 15 laps on tires, and can get into the mid-1:42 bracket. The 2-tire-change 27:01 wasn't reflective of what the 911 can do - I was stuck in traffic for a few laps. Fortunately, Fraga was very much human, not getting past 5th before his first stop, which came on lap 4.
All good things must come to an end - I got my first (of likely many) 3-star Wheels of Despair this month on this account (and 3rd of 12 between the two). It puked out the low-showing 10,000 Cr.