So a Tdi is likely to return 24-28mpg real world. They can do better, but you'd really need to try. A V8 is going to use more fuel, more like 15-18mpg and up to maybe 20mpg on a run.
Don't know how many weekend miles you'll do, but making a few...
Yes they are tight. Old bushes are about 49.85mm dia. The arms are about 49.7mm internal, but are about 0.25,, bigger on one side measured with my vernier. New bushes are 50.2mm even after freezing overnight.
So heated the arm ends a bit &...