Wistrick said:
I talked to Erine and the price tag of $1000 plus shipping kinda turned me off...Also need to be able to convert back to stock when wife goes with...
I can appreciate those aspects. Custom fuel cells are not something that you can manufacture quickly, and time & quality cost money. I've paid that price twice in the last 10 years or so. When I sold the first one, they were no longer available and I got 1.5 times the original purchase price, plus shipping.
FWIW, the fuel cell comes off in 5 minutes and you can toss the passenger seat back on. Ernie also sells a non-flat bed design that fits on the back rack area and allows use of the passenger seat at the same time. The current design is slightly different from mine, but should still be very simple to remove and replace as needed.
Back to your original questions - depending on which flash you have, that may not impact the mpg all that much. The CO really shouldn't impact much either. The Arrow exhaust, perhaps. But really it's about riding style and wind resistance to a large degree. I used to ride with a guy with the exact same bike, year, ect, but he had a larger windscreen and big 6" aux lights and he consistently got 4 mpg less than I did, riding together, with equally smooth riding styles. It was just the extra wind resistance of his choice of accessories.