Check for an exhaust manifold leak. They are loud under higher loads, but can be competely quiet at idle.
I use a stethoscope, with a long stainless tube on it, and can hear the leaks plain as day.
It's possible.
Here in NZ, a lot of 4x4's didn't have the body mounted lights working, only the bumper mounted ones - the body ones didn't have the correct viewing angle, as rear mounted spare wheel obstructed them... so they were blanks. Seems...
A relative had a Telsa S P100D, towing a fairly light, but boxy trailer cut his range down TO between 25 and 30% of the range doing the same trip without the trailer!
His next car was one of those Mercedes SUV+Coupe things, with the twin turbo...
I'm in NZ, which screws everything up for trasfer case swaps with you :(... but I'd LOVE a 1.4 for my Disco 1 V8.
Just be careful with the 1.2 - be sure it'll work out, before spending the cash on it.
I'll assume you have manual, which gives an...