10-10-2022, 08:03 AM
(09-10-2022, 07:33 PM)Mike Costigan Wrote: As for likely consumption, I can easily better 50mpg on a long steady-speed run (at say 45mph) whilst I would be disappointed to get worse than 40mpg in a day's motoring in the Peak District with perhaps 50% use of second gear (1931 RM saloon with 3-speed gearbox and standard FZB carburettor). I have never checked consumption on short-run local trips, but without getting the engine thoroughly warm (not just water temperature) I would not be surprised if it was no better than 30mpg. (all in Imperial gallons).
Hi Mike
I am pleased that someone else gets high mpg figures. I record mileage and fuel use quite accurately every time I fill the Special up and was almost worried to find it has achieved over 50mpg in the 3000 miles I’ve completed since it’s build two years ago (2000 in the last year!). That includes a few longer runs towing a 100kg trailer!!
It is very light (350kg) and has a tuned engine (Ricardo head, SU and 4 branch manifold). It also has a 5.25 rear axle and Andes second gear which I think helps.
Unfortunately I so enjoy driving the Special that my RK get too little use for me to comment on fuel consumption.
Cheers
Howard