Well sounds like if you've done 68 miles, you can probably push it to 90 but
take it SLOWLY.... this is NOT the time to be um...macho and push for time.
Trust me the sweet feeling of making some kind of time record soon fades in the
pain of injury.... I know... so been there done that... :(

Also, I would suggest not only carb loading before the ride but take stuff like
Power Bars or Balance Bars (whatever your poison) along. For drinks, plenty of
water and also the sports drinks (to replenish the potasium etc). Stay away
from soda (way far away)...

I've found I can push the mileage if I take it slowly. At 43 if you do
something foolish, you can get injured and the older you are, the longer it
takes to go away. I am STILL fighting an injury from LAST YEAR when I decided I
was going to be super old bag and do "Namaste Yoga" with the sweet young thangs
on Fit TV. Now I call it "nasty yoga". argh. I am 63 and that's a world of
difference from 43 but still....

Good luck!

Sue

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