If I were you, I would use what you have. It sounds like you need some sort of suspension under you and that the speeds are too high on the gravel for a motorcycle/scooter to operate safely with other vehicles on the road.
You may not get the grreat MPG but you sure will turning that odometer a whole lot less. When you do your year end cost savings you still end up way ahead and you will have the extra time as at the cost of a few MPG's.
Congrats on the new Job 
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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