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For those of you with 1275 motors, twin SU carburetors and the original 4-speed transmission, what highway mileage are you getting at speeds between 55-65 mph?
I am guessing you either meen fuel consumption or RPM. Yesterday I was out on the Highway and speed was between 55 - 75 for two hours. I averaged 26 mpg. Car is stock 4 speed, twin sun with 20,000 miles on the engine. In 80 degrees car ran at right on N all day.
Allan
Mine has been on blocks for a little while now,but before I put it up, I was getting pretty consistent 24/26 mpg on daily commutes on I95 at speeds between 55 and 65! The best I ever got was 30 mpg!
Alan-Yes, I meant fuel consumption. Thanks everyone for your information. Two more questions. What kind of terrain were you driving in to get that kind of mileage, and are you running with a stock fuel tank(which I assume is about 6.5 gallon capacity)?
1275 dual SU's. 36 MPG average on the trip to LOTO last year. Blue highways with a 3.73 rear gear. Regular tank and stopped every 2 hrs for fuel and to get the kinks out.
Hi, not sure of the equation but I get approx 40-42mpg (UK Gallons though) on a good flat motorway run at 55-60 mph.
MG Metro head (cooper S sized valves), LCB header/sports exhaust/K&N filter/twin 1.25" SU's.
I never had SUs on mine but with the weber and 3.90 gear and 4 speed I got 36-38 mpg. With my 3.55 and 5 speed and 175/70/13 tires,I get in the low 40s but then 70 is only about 3100 rpms now in 5th. I set this car up for long trips and just cruising but the disappearing water problem is still holding me back on that.
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