Long time viewer first time poster! I have an 1018 Volvo XC90 T6 AWD (Haldex AWD unit) with the Aisin TG-81SC 8 speed automatic transmission. 80k miles (bought it used at 56k). Spark plugs replaced at 60k. Always put 91/93 in the tank. I used the Autel AP200 (Bluetooth) scan tool to investigate why I’m seeing a 2MPG fuel economy reduction. The short and long term trim values are at about 3.6% so I guess it’s adding fuel. The car hesitates for about 500ms when floored (even in sport mode). I don’t recall if it hesitated before. No MILs/DTCs present for O2/MAP/MAF. This model has no fuel filter (just a screen on the fuel pump.) Engine air filter replaced last week, also dumped a can of https://www.fcpeuro.com/products/fuel-system-cleaner-500ml-can-liqui-moly-lm2030 per a recommendation from FCPEuro. Due for an oil change tomorrow but I doubt that’s it.

What do you think it is, or what next recommended diagnostic steps should I take?