HDI more MPG

[tigerstyle]

I'm up and down the M1 a lot (and not willy waving) but it's all too easy to sit at 85 for a couple of hours at a time, this is bad for my MPG
doing the same journeys at 70 I'd expect moped levels of MPG given I've done the nice economy mods (stage1, no cat, no backbox, serviced with high psi tyres)

My long term average is only 55, would love to see it at 65 and should really if idiots wern't always getting in the way...