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Old 03-21-2013, 05:49 AM   #5 (permalink)
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Join Date: Apr 2011
Location: Southern France
Posts: 159

AX - '95 CitrŲen AX

307 - '04 Peugeot 307 SW
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Originally Posted by Piwoslaw View Post
Actually, most BSFC maps suggest that IC engines are most efficient around 80% load, with rpms around max torque.
The BSFC chart thread
I've been able to test that. My average consumption on the flat at 75 km/h is 3,05 l/100. On a 2,5% average slope, at the same speed, the consumption didn't exceed 3,50 l/100 (5th gear, 1900 rpm, throttle pressed at about 75%). After calculating the power needed in both cases, the engine efficiency is 21% on the flat and 35% on that slope.
CitroŽn AX 1.5 D 430.000 km
Peugeot 307 SW 2.0 HDI 136 195.000 km
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