What's your RPM at 70mph?Watch this thread
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I don't have a rev counter though ;(
On a bicycle going downhill (srsly i highly doubt I've ever gone over 50 downhill though)
Keep an eye on the temperature gauge if you're worried, but it sounds quite normal.
Or, 29mph per 1000rpm in O/D 4th.
Anywho i estimate around 3000-4000 RPM in my micra (no tachometer to confirm but i think its around there due to engine noise)
I'm sure you're waiting for someone to ask this
how do you know your exact rpm? I would have said it was some sort of digital one, but you only drive classic cars!!
Although, if you want to talk about *my* car specifically... @ 70mph the guage would probably waggle between 2300rpm and 2500rpm. Good old smiths guages, eh?