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Citroen C5 2005 with EW10A and 5spd manual gearbox, on winter (from -15 to -25C, or 5 to 13F) had about 31mpg fuel consumption avg. on 25 mile trip.
It had ~3000rpm @ 60..62mph if I remember correctly.
On summer without ac should have been possible 33.6mpg or better fuel consumption.
But it is almost same as the BMW E39 fitted with M52TU or M54 engine.
Only being more economical when driving on city / slower than 50mph, because of the gearing.
Even tho the C5 has lower drag coefficient and frontal area (?) and is a lot lighter.
I did like the engine. Easy to drive and had plenty of power.
Had about 138-140hp/200nm even tho the engine was quite worn since I rebuilt it with original pistons (bought it with very bad oil consumption problem), where a stock 325 E36 can have 150-160hp/200nm depending of the engine's condition.
Not sure how much my light porting to cyl.head and 3-angle seats had effect, probably nothing noticeable.
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