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Gas mileage reporting [4.9L w/ manual O.D. and 3.08 rear gears]

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1986F150six
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Posts: 305
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Location: Northwest Alabama

Gas mileage reporting [4.9L w/ manual O.D. and 3.08 rear gears]

Post #1 by 1986F150six » Tue Sep 18, 2018 3:39 pm

Well, I am back from the 2018 Garagemahal Ford Truck Show in Skiatook, OK [what a great time to be had by all who attended!!!].

I attended in 2017, but due to mechanical problems with my truck, was unable to drive it.

I decided to update this older thread by including the gas mileage for this year in the same format as before. Since the previous listings, the distributor has been replaced with a NOS Motorcraft Duraspark distributor which was recurved by WSA111. Bill asked if I might be interested in slightly better performance and gas mileage, but would be required to use 89 octane gasoline. I agreed and the static timing is @ 16* BTDC.

This year, I decided to drive to get there as quickly as possible and drove the speed limit or with the traffic flow [faster].

Instead of my "normal" tank-by-tank description, I am going to provide the overall average for the approximately 1200 mile trip as compared to the previous 3 years.

2014 55-62 mph with no aerodynamic modifications = 21.93 mpg [highest tank = 23.26 mpg]

2015 55-62 mph with aerodynamic modifications = 24.13 mpg [highest tank = 25.72 mpg]

2016 55-70 mph [weighted towards 65-70] with aerodynamic modifications = 22.05 mpg [highest tank = 23.46 mpg]

2017 Missing data due to having driven another vehicle.

2018 65-75 mph [closer to 75] with no aerodynamic modifications] = 19.87 mpg [highest tank = 21.3 mpg]

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THE FRENCHTOWN FLYER
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Re: Gas mileage reporting [4.9L w/ manual O.D. and 3.08 rear gears]

Post #2 by THE FRENCHTOWN FLYER » Tue Sep 18, 2018 4:57 pm

Thanks 1986F150six.
Good useful data to digest, and answers the most frequently asked questions regarding vehicle aerodynamics and vehicle speed.
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arse_sidewards
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Re: Gas mileage reporting [4.9L w/ manual O.D. and 3.08 rear gears]

Post #3 by arse_sidewards » Wed Sep 19, 2018 7:51 am

1986F150six wrote:Well, I am back from the 2018 Garagemahal Ford Truck Show in Skiatook, OK [what a great time to be had by all who attended!!!].

I attended in 2017, but due to mechanical problems with my truck, was unable to drive it.

I decided to update this older thread by including the gas mileage for this year in the same format as before. Since the previous listings, the distributor has been replaced with a NOS Motorcraft Duraspark distributor which was recurved by WSA111. Bill asked if I might be interested in slightly better performance and gas mileage, but would be required to use 89 octane gasoline. I agreed and the static timing is @ 16* BTDC.

This year, I decided to drive to get there as quickly as possible and drove the speed limit or with the traffic flow [faster].

Instead of my "normal" tank-by-tank description, I am going to provide the overall average for the approximately 1200 mile trip as compared to the previous 3 years.

2014 55-62 mph with no aerodynamic modifications = 21.93 mpg [highest tank = 23.26 mpg]

2015 55-62 mph with aerodynamic modifications = 24.13 mpg [highest tank = 25.72 mpg]

2016 55-70 mph [weighted towards 65-70] with aerodynamic modifications = 22.05 mpg [highest tank = 23.46 mpg]

2017 Missing data due to having driven another vehicle.

2018 65-75 mph [closer to 75] with no aerodynamic modifications] = 19.87 mpg [highest tank = 21.3 mpg]


This sounds about right. My stock height '94 with E4OD, 3.08s, 31s, 4x4 and missing the stock plastic under the bumper routinely got ~20-21mpg on highway only drives at 55-70mph.
1994 F150 4x4 8ft, engine is basically stock.

66" leafs, extended radius arms, lockers in both ends, nothing special.

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