Gordon Murray microcar has better partners
 

Gordon Murray Designs, Shell and Geo Technology collaborated with a concept car - three collaborators, three-seater and three cylinders. The focus is highest mileage & efficiency (89 mpg at 70 mph and 107 mpg at 45 mph), minimized moving parts friction and safe & reliable urban use.

Still a dino-juice sipper.

https://www.youtube.com/watch?v=n-br2TmVQN0

You mixed up the numbers.

https://www.projectm.shell.com/asset...%20English.pdf
The car’s gasoline consumption has been measured using a range of vehicle testing protocols covering both steady state and urban driving styles. Sample test results include a steady state consumption of 107 miles per gallon [2.64Litres per 100km] [38km/Litres] [89.1 miles per gallon US] at 70kmph/45mph and an improvement of 4.67g CO2/km on the New European Driving Cycle (NEDC) from the use of bespoke lubricants, equivalent to a 5% improvement in fuel efficiency compared to standard lubricants available in the UK.

That is 107mpg (uk gallons) at 70 kilometers per hour = 89.1mpg (US gallons) at 45 miles per hour.

You say to-may-to, I say to-mah-to.