The outgoing A4 had a mild hybrid 48V to assist with stop-start and offer a 1-2 MPG fuel savings. Some German manufacturers have a more aggressive MH, where the engine is not running on low-speed coasting, or the first few seconds pulling away from a stop at low speed. I remember reading that only Europe gets the MH on both a Diesel and perhaps a gas version, and not the US. However, the dealers keep telling me that the current US spec has it. There is nothing on the stickers either (Usually, the engine specs mention it).

 

MLB evo MHEV was 12V for the EA888 4-cyl, and 48V for the EA839 6-cyl and EA825 8-cyl.
PPC MHEV is thankfully 48V only. But MHEV is always a vehicle config option, not a basic component of the engines.

And not sure what "true" is meant to mean. Either you have an electric assist to vehicle propulsion or not. And either that motor voltage is high (HEV, PHEV, BEV; 200V+) or mild (MHEV; 12V, 48V).
A vehicle that had a 48V electrical subsystem but used it only for various electrical consumers like active rollbars, electric refrigerant compressor, electric supercharger, and such without actually having an electric motor to apply force to the drivetrain would not really be a MHEV. But such a vehicle would never be constructed either. The 48V generator would certainly be a BAS at a minimum.

Audi refers to the MHEV in the PPC platform as MHEV+, a marketing term. But it does have more MHEV than the MLB evo 48V, as it has both a BAS and the PTG.

https://vibratesoftware.com/about-us...onfigurations/

So MLB evo MHEV was a P0 design, using a BAS (or any number of other acronyms people like to use). MLB evo PHEV was a P2 design, and PPC doesn't change that. PPC MHEV+ introduces the PTG drive motor, at the P3 location.

The PPC (not-PHEV) engines in RoW are:

110 kW b-cycle 2.0 TFSI -> A5 ICE
150 kW b-cycle 2.0 TFSI -> A5 ICE / Q5 MHEV+ / A6 ICE

200 kW 2.0 TFSI -> A5 MHEV+ / Q5 MHEV+ / A6 MHEV+
270 kW 3.0 TFSI -> S5 MHEV+ / SQ5 MHEV+ / A6 MHEV+

150 kW 2.0 TDI -> A5 MHEV+ / Q5 MHEV+ / A6 MHEV+
220 kW 3.0 TDI -> Q5 MHEV+ / A6 MHEV+

NAR PPC have no lithium batteries, no 48V electrics, no MHEV facets at all. Pure ICE like a B8 or B9 prior to MY21 here. And the PPC PHEV are not offered here either. The RS5 will be PHEV because it's the only config for that vehicle. Will the upcoming Q7 and Q9 change any of that? Will time change any of that for the A5, A6, or Q5? No idea.

 

Short answer - no, the US cars are not hybrid at all. In fact, this means the B10 A5 has actually lost hybridization from the B9.5, which was a mild hybrid in the US.

Random side note, I just switched insurance carriers on my B9.5 S5. My car was listed as a hybrid according to State Farm. Apparently they didn't get the memo.