Not crazy, but Defender wasn't really designed for long-distance motorway use.
I used to drive my (then) 3-year-old Freelander 1.8 for commuting daily 40 mile round trip.
Warm and comfy, and quite fun, but the fuel costs were not good...and then the repair bills started snowballing.
After service bills of >£900 2 years running, I thought "
I can buy a second hand car for less than that", so I did -- a Peugeot 306 1.9 DTurbo.
Freelander was kept for family use, and Pug for commuting...
...until the Freelander suffered its inevitable (third, and this time, terminal) head gasket failure.
Then I bought my Defender
That was 6-7 years ago, and I am still driving a 'two-car solution':
-- 1997 306 (I'm now on my third!) for commuting and motorway driving;
-- 1993 Defender 110 for family, dog, bicycle rescues, furniture removal, garden waste, camping holidays, snow, floods, and general fun!