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I have had the Power Pure on my Aprilia for several months now and yes they are pretty good although they do not balance up as well as the Pirelli but better than the Slovenian Goodyear/Sava. Local dealer sells them installed for about what they charge on the internet for a 120/70-15. Watch out as they are available in bias and radial and you do not want to mix them together on the same bike. The tread pattern is less likely to feather during heavy braking making them less prone to developing head shake.

1000 to 1500 for a 150 is the norm depending on your tune. Is it creeping right now? Whats it reading at 50 mph?

I do not believe the average 150 has anything reading the cam to tell when its on the compression stroke nor has any feedback from the coil to gather that information so it should spark at every rev since it does not have a cam driven distributor or a magnetic pickup on the end of the camshaft or any other means to tell the difference between a compression stroke or exhaust stroke. If you take the plug out and crank the engine with the base of the spark plug grounded against the block with the high tension lead connected you should see whether it sparks on every revolution or not.

Be mindful that its just a thing. Don't really need to remember much specific to it since its a fairly simple two stroke. If its been sitting indoors unused for so long and has no appreciable wear I don't really understand replacing the piston and such since only the fuel lines and high tension wires really needed attention along with a carb bowl gasket with a float valve seat. Mostly should have just needed cleaning up and replacing of the rubber/leather parts.

Now if you were talking 1950's 35 to 50 hp automatic compression release two stroke outboard boat motors that is a whole nother matter. Dealing with the floating trigger coils, daisy read plates and automatic compression release mechanisms can be very challenging especially when they have been sitting unused for over 40 years after being exposed to salt water. Getting those twins with their big iron wedge pistons running can be frustrating but satisfying. A big Twin Evenrude or Johnson from the 50's has a certain music to it when its running right.

The more upright tank will probable let you run it closer to empty but we are only talking about 102 ounces total fuel and using the last 12 ounces at this point or less than 10 miles difference.

The bottle needs to be rated for gasoline. Water bottles especially if they are environmentally friendly can turn to putty if used for gasoline.

You are going through the same frustration that I had with the Lance/Znen 150. At around 30 mph with little stop and go I could get as much as 64 mpg after I put in the Hoca variator and really tuned the CVT after pristinely cleaning up the fuel system and setting the valves to perfection however the norm at 45+ mph was 50 mpg.

When I looked at my fuel logs I found with the floor board tank I actually had a whopping 1.3 gallon so I had that backwards (senior citizen trying to remember specs from 5 years ago) and even that is unacceptable if you ride daily to commute. Yes I was always fearful of running out of gas at 1.3 gallons while at 0.8 I would have been paranoid. The trade off with the floorboard tank is that you need a fuel pump which can lean out at high speeds.

After running the Lance 150 from September 2010 to April 2011 at I walked into an Aprilia dealer on a lark and found the Sport City 250 with a 2.4 gallon tank that got better fuel economy than the Lance and was interstate capable. The better fuel economy and lower monthly cost to keep it on the road actually made up for the payments. The running joke was that with the Lance it would have been less work to just get a part time job to pay for the gas to drive my van to work every day. In the past 30,000 miles it has cost less to keep the Aprilia running than it did to own the Lance from 3,744.0 miles on the odometer when I bought it to 6,746.8 miles when I traded it in. With the Lance it was a constant bleeding of cracked heads (multiple), cracked mufflers (multiple), failed ignition pickup, bad belts, fuel pump impacted by ethanol so it couldn't keep up, monthly oil changes, failed mirror mounts, fender mounts failing, starter electronics failing, CDI failures, clutch failures, gearbox failures,
worn out variator, etc. At 30,000 miles I still do not need any engine work and the variator along with the clutch are still almost like new. The only problem I have had was the last belt which I purchased from a local Vespa dealer was old stock and failed after 2,000 miles so I have to clean that up and I am now resolved to purchase belts only from a large high volume dealer and not a small local shop that lets belts sit for years hanging on hooks expose to sunlight.

Yes the Piaggio 200 to 300 cc bikes can get better mileage than the GY6 150 especially at speeds over 40 mph. The GY6 150 cc is at its peak mpg at between 30 to 35 mph while the Piaggio 200 to 300 cc bikes are at their peak mpg at 40 to 55 mph. I get much better fuel economy overall on my 250 than I did on my Lance/Znen 150 GY6 since most roads where I ride have 40 to 60 mph speed limits. Where I ride, a GY6 150 would be past its max speed for peak efficiency while the 200 to 300 cc bikes are in their peak efficiency zone at those speeds.

With a 0.8 gallon tank you have around 102 ounces of gas which at 50 mpg gives you 0.39 miles per ounce or gets you 10 miles for every 26 ounces of gas. You will consume about ninety ounces of gas at 35 miles leaving around 12 ounces (1 1/2 cups) in the tank which will look almost bone dry in the oblong flat tank under the floorboards. You will be out of gas when you hit 40 miles. Even if you can increase fuel economy to 60 mpg you will need to stop for gas before you hit 43 miles since you will only gain about 8 miles per 0.8 gallon tank of fuel.

Only if you change to the tank under the seat which usually involves also relocating the battery and such.