My Ultra Classic motortrike with a 103 gets maybe 30 mpg now and then and I've almost run out of gas several times. Can you safely carry a gal of gas in the bottom trunk? I suppose it has to be vented somehow. Does anyone sell something like this! It runs good and sounds good with 91 octane. On the road, if I have to make a choice, think I would go for 87 octane rather then 91 with 10% ethanol just from listening to the motor.:xzqxz: