There is already a thread about it. It comes from the Sling 4 which had a 914 turbo.
They were clever to be one of the first to aviate a 915.
A french company was the first to make a certified plane with the 915, with about the same specs, but they don’t care about selling them 
Google APM 41.
148kt true could be doable at 20,000 feet. Remember it is a turbo.
Peter wrote:
Obviously it isn’t doing 148kt TAS at 28 litres per hour…
Surely the Mooney M20J I fly does 150TAS on 7.5Gal/h (28L/h) between 8kft-10kft on LOP economy (never looked at my TAS to be honest but it does maintain 120ias on 7.5G/h all the way to 8kft-10kft up and back with WOT & 21rpm/22rpm on cruise), the book is probably 5-10TAS higher…
Obviously it isn’t doing 148kt TAS at 28 litres per hour
With a 915, why not? A typical sleek UL does 100 knots at 10 lph.
A 2 seater, of course. Much less cockpit volume.
Wow, nearly 148 kts TAS on 7.5 USG including the announced payload, that’s defying physics.
Everything about that plane sounds too good to be true, but lost of videos and news stories confirm (most of?) the claims.
They did a flight non stop California to Sun&Fun, 13.5h, 1900nm.
https://www.aopa.org/news-and-media/all-news/2019/july/pilot/breaking-boundaries
I remember a video from last year of a guy flying to Oshkosh in one of these and he reported something like 140-150 KTAS at 31 L/h.
I can’t find the video so I can’t confirm the numbers but I remember calculating the specific consumption and getting a worse number than a lycoming 0-320.
Oh, and that’s the kind of stunts the factory has done for years, like trips around the world.
