I'm a bit late to the thread but 70mph is no better or worse (probably better being a diesel) than 60. I'd change the oil every 10k miles personally. Other than that, the fact you're taking it on long journeys will automatically make it more reliable than most cars of the same type.
I guess you could argue filling it up with decent fuel could help? Trouble is there's so many conflicting accounts on both sides it's hard to tell.
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