Depends,
Swinley – Ride form my door, 5 miles, time depends on that days SS ratio! £free
Trolls – 30minutes – £7return
Chilterns (Pangbourne) – 33 minutes -£8return
Interestingly, it’d actually be cheaper to catch the train to Pangbourne than drive!
Assuming that the most I’d drive in a week would be 2 x trolls rides and 1x Pangbourne ride that’s £22, not sure if that’s good VFM or not! But equally I’ll often just ride Swinley for a week which is free. Or drive to the Peaks for a weekend (3h30min, £70).
I find it amazing that some people will drive for hours to ride their bikes. A day riding when there is sometimes more hours spent In the car is crap! Pretty much all my riding is done from the door.
Depends how you do it, I’ll often pack the car after dinner on Friday and Bivi in the car/carpark, no point setting off early, more discreet to arrive at midnight when no ones looking. Then do a 4 hour ride after breakfast, doss under a tree watching the world go by with a big lunch, then do it all again, and again on the Sunday, crams an epic amount of riding into two days!