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My car i believe would benefit from one profile higher. ie going from a 55 to a 60 as i always seem to be looking for gear change around 55mph car pulls like a train at this speed in 5th. 5th gear is geared to 22mph per 1k rpm. Max torque is developed from 2k rpm up to 4k rpm. If i go for a 60 profile i think from a tyre calulation site my speedo will be 3% slower. Do 50 mph on speedo means im travelling at 51.5 mph not a huge difference but hopefully pay divdends when i come to replace tyres in a couple of months.
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