I love these bikes. I purchased two 2008 models from Pep Boys at discount of $600.00 each, with both missing parts. They all have issues, but for the price, you just have to do a little preventative maintenance and common sense.
I went thru both bikes. It took me a week to do, and added safe ties and Loctite everything, and silicon-ed all clip nut screws, and replaced all cheap fuel lines with new clamps and American hose 3/16". Nothing is now loose or vibrates.
I also have issues though with out of round rims. A cheap fix is buy a new rim from aftermarket or eBay, which is the same stuff the dealer has to offer.
I put 4000 miles on my bike, and wife has 1200 on hers. I drive dependably every other day to dialysis with no problems. 45 mile round trip. Not a Honda, but also all parts are cheap, and not high Honda or any other manufacturer pricing. Again, good bikes for the money.
If you are not mechanically inclined or can't work on your stuff, then do not buy. Good, cheap fun bikes.
My gas mileage is right at about 95 to 100 MPG, cruising at around 40 mph GPS verified.
Also another factor is the head lighting is not the best, but will get you by. Do not add halogen or brighter wattage bulbs; they will melt the housings out.
My last thought is change out the belt to a name brand good quality, or you will be sorry. Both broke around 1000 miles. Get a Gates Kevlar or equivalent that will last a year or more of long riding.
I know all this from one year's experience with the Baja SC150 scooters.
Thanks for reading.