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get a gauge. you haqve to be 'top of mind' aware.
I am willing to bet you this:
1. you don't get there averaging 80 mph over 8 hours.
2. with a gauge, you'll find your average speed, while driving '80 mph' is probably 70mph.
3. But if you drive 70mph, your average will be closer to 64-65mph.
the reason is, unless you are on a flat raod all by yourself w/ no hwypatrol, you are slowing down for various reasons.
I drive 11-13hrs over 3 days on trips to texas and has records and personal exp to back this up.
also, mpg falls off exponetially above 65. So at 80mph you are pouring money down the drain compqred to 65.
but get a scangauge. I have had one for 3 yrs and swear by it.
since it is a hwy cruiser majority of the time, look at going up one size in tire size. there are plenty of threads on that topic...for cars. There seems to be some disagreement on trucks.
Concider changing out the rear gear. if in fact your on the freeway that much, it might be worth it.
pump up the tires. (see other threads)
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