"Buy a plug-in hybrid and never plug it in, and congratulations: You've invented the world's most complicated way to waste fuel. There's really no point in buying one if you don't charge it, and this is a bigger issue than you may think. You're not going to come close to the manufacturer's claimed efficiency numbers. It might even use more fuel than the same vehicle with the same engine but without electrification. It's just not a great idea."
"Making a diesel PHEV is hard, which may be why only Mercedes makes them today, as variants of the C-Class, E-Class, GLC and GLE. The diesel engine needs heat to work at its most efficient, likes long slogs at constant rpm and is just not as well suited to the stop-start life of a PHEV. In a diesel, there's also a particulate filter that really doesn't like it if you turn off the engine midway through its regeneration cycle."
Plug-in hybrids that are not routinely charged deliver far worse real-world fuel economy and can use more fuel than equivalent non-electrified models. The Mercedes-Benz GLE 350 de pairs a diesel engine with a plug-in hybrid system, an uncommon configuration that overcomes diesel-specific challenges. Diesel engines require heat and long steady operation, and particulate filters can be harmed by frequent engine shutdowns during regeneration, which complicates PHEV duty cycles. The GLE 350 de achieved nearly 53 miles (85 km) of electric range in a real-world test and approached the WLTP claim of over 62 miles (100 km), while avoiding excessive fuel consumption when battery charge depletes.
Read at insideevs.com
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