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Old 04-26-2014, 09:00 AM   #11 (permalink)
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Josie - '87 Toyota Pickup
90 day: 27.96 mpg (US)

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Fascinating results! And the Mustang really seems to like the Sunday sightseeing pace.

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Old 04-26-2014, 01:50 PM   #12 (permalink)
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Wish the U.S. petrolium companies would sponsor "Fuel Economy" runs, again, like they did back in the 1950's!
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Old 04-28-2014, 03:24 AM   #13 (permalink)
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ITZOLD - '81 Ford Mustang L
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Quote:
Originally Posted by Old Tele man View Post
Wish the U.S. petrolium companies would sponsor "Fuel Economy" runs, again, like they did back in the 1950's!

Without casting dispersions upon a business be leagued by too many smoking gun conspiracy theories to be a coincidence,


I agree! It would add some boy scout points to an age where there are no points for thrift in an age of gluttony.


There were lots of total economy runs which were unofficial

I leave you with the thought...30 US mpg is easily achievable with a 3.3 liter I6 at 55mph as was the case with the 3.3 1981 4 speed SROD 3.08:1 axle Mustang and Capri, and 35.9 US mpg at 45 mph with the 67 Mustang 3.3 3 speed manual 3.20 axle with a few mods.





Imagine if I could reduce the 1964.5 to 1982 3.3/200 Mustangs 45 mph road load enough so that at 60 mph, it would have the same road load as at 45 mph?.


That alone would be enough to gain close to the 44% economy improvement I've made this month by scaling back my open road speed.


Given that the hp required for an given speed is able to be calculated below but you must know the tire size in mm, the cd and FA, using the metric 1980 Aussie Total Economy Run formulae

Quote:
400M swap?
cd*FA *mph*mph*mph * 1.27
. . 147733

Then add tire loss

mm*lb*mph*8
. . 58 036 680
.



An approx rough calculation for a 67 or 81 Mustang to make to make a constant steady state 45 mph is that the combined big five (full drive train = 1.transmission/engine and 2.axle) , 3.rolling resistance, (aerodynamic = 4.frontal area and 5.cd) requires about

7.33 HP + 3.26 = 10.59 hp with 0.45 cd, 20.8 frontal area, 195 mm tire, 27% total drive train loss, 2700 pound weight


At 60 mph, with a 0.22 drag modified body kit, 20.8 frontal area, 195 mm tire, 27% total drive train loss, 2700 pound weight

that would be to 6.69 HP + 4.36 =11.05 hp


I'd like to be able to get 30 to 35.9 mpg at 62 mph like the old timers did at 45 to 55 mph


Last edited by xecute; 04-28-2014 at 03:37 AM..
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