Join Date: Sep 2000
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Re: 78-79 bronco milage
You won't be pullin' down 19 with those motors
The 351 and 400 Ms were heavy, thirsty devils with very little relation to the smallblock 351 Windsor and it's fuel concious cousin, the 302. True the Ms can be built to deliver a pile of power and torque, they never came with fuel injection or O.D. automatics and non-lock up C-6's weren't known for delivering the best mileage (just rock solid dependability and handling gobs of power).
If you could take the pain at the pumps a 360 equipped Ramcharger with fulltime 4WD can dish out, you won't be getting any worse from an M engined Bronco(maybe slightly better).
Lately in all the cold weather and the 85mph rips into the city, my EFI 302 is down around 13mpg. In the Summer after a few ignition mods I had been posting 19 mpg combined.