Modern Vespa

I read here recently in an old thread about the differences between Vespa & LML motors, and I think it was Rob Hodge who said that LML went reed valve to get better fuel economy because gas is so expensive in India compared to most wages. Then I just read a thread on the modern side: Primavera MPG on Freeway Vs rural roads where a guy w/ 2 modern Primavera 150s regularly gets around 100 miles per gallon on both of them. I know there's no way our two strokes can come close to that, but I have never tried to figure what kind of mileage I get on my short & medium runs where I am often gassing hard and revving the tits off of the thing. I have a stock 150 LML motor on one bike, but my others here are kitted or P200 motored.

I should run the LML to empty, add a gallon of gas and use GPS to see how far I can go driving conservatively... Anybody done this or wanna do the same w/ a stock three port 150? And do you think 2 port vs 3 port makes any difference?

I just finally got my speedo to work on Bear so I chime in here, I got 59mpg with the VMC177.
I don't have 2 port data for you yet, just started getting Bluey up and running. On my first tank of gas with that one. I can almost guarantee it'll be much higher than 59mpg though. We shall see!

I think the most I got on a 2003 Stella I had back in the day was 70 mpg. I think it had gotten more, but this figure was taken after the carb was rejetted, air filter de-blued and a Sito exhaust was installed. As a comparison, the GTS 250 that belongs to a friend that has been in my garage for some months now gets about 70mpg.

Not long after I got my first Vespa, a 60 VBA I was thumbing through the factory service manual (translated into English) and it said the stock 1960 Vespa VBA 150 is rated for 100 mpg.

"No way.", I said. Then I saw that was at 22 mph in top gear. Basically as slow as you can go in top gear without lugging.

I didn't want to or even know how to travel at 22 mph without stopping long enough to get a fuel mileage reading.

I knew what mileage I got at 40 mph so I found a more or less deserted road, got up to 40, shut off the gas and counted how many utility poles I could pass before it sputtered. Then I did the same thing at 22 mph and after doing the math I found that the manual was correct. It would get 100 mpg at 22 mph.

Who'da thunk it?

I've got a pretty close to stock 2005 PX150.
Pre-drilled air filter, Polini Box exhaust, and upjetted to match.
It's not a daily rider and I ride a good mix of moderate speeds (30-45 mph) with the occasional WOT to make it to the light while it's still green or to pass a bus or Sunday driver.
I've been keeping a spreadsheet of every gas purchase since August of 2018 to the present day.
I've gone 7984 miles, put in 130.7 american gallons, and according to the spreadsheet I get 61.7 mpg.
YMMV (literally!)

Great topic. Honestly, I personally don't think that 100mpg is achievable under normal conditions. Even on ideal road conditions(riding on flats at around 45-50mph) you would probably get maybe 60-65mpg at most (I think).

I had a stella years ago with a Polini 177 and I put a GGR carbon fiber reeds but I couldn't tell much of a difference. In order to get a solid result you would have to pick a route where the elevation and speed is consistent and stick with it and re-test a couple of times to see.

There are other factors such as your weight, mass, tire inflation that affects this scooter a lot. my .2c