18-04-2022, 03:02 AM
Such products were endless.
In the 1940s my father used to closely check consumption of our RP, often letting it run out (seldom a hazard in the traffic then) Twice a year we journied 200 miles to visit grandparents. With two 1940s portioned adults (9-10 stone) and two small children he regularly noted 50 mpg. Speed was kept to 40 mph as he found faster too tirng on the narrow bumpy and winding main roads of the time. No traffic holdups (except stock drives!) and no traffic light stops. I ran a Javelin for decades and tinlered with jets. Around town economy was improved from low to mid 20s, and it did 30 mpg cruising at 60 mph. But the car was plagued with burned XB valves and pocketed seats.
In modern traffic it is near impossible to drive a Seven economically. For those with manual advance there may be a gain available from generous advance at light throttle.
In the 1940s my father used to closely check consumption of our RP, often letting it run out (seldom a hazard in the traffic then) Twice a year we journied 200 miles to visit grandparents. With two 1940s portioned adults (9-10 stone) and two small children he regularly noted 50 mpg. Speed was kept to 40 mph as he found faster too tirng on the narrow bumpy and winding main roads of the time. No traffic holdups (except stock drives!) and no traffic light stops. I ran a Javelin for decades and tinlered with jets. Around town economy was improved from low to mid 20s, and it did 30 mpg cruising at 60 mph. But the car was plagued with burned XB valves and pocketed seats.
In modern traffic it is near impossible to drive a Seven economically. For those with manual advance there may be a gain available from generous advance at light throttle.