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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-24-2008, 12:02 PM   #1
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2002 cab auto 330ci low mpg problem

Hi All

Ive owned in the past a 330ci coupe and 2 M3's ive since bougt a house now and gone back to the 330ci.

I have noticed i'm only getting roughly 20 max MPG. Ive just bought the car and noticed im using quite a bit more petrol than i did in the M3.

The car has done 70K and on aftermarket 19" wheels so i would expect to use a little more.

I'm wondering if I chnage the spark plugs, air filter, fuel filter and possibly ran some RED EX through it would it help me in any way ?

Many thanks, Ben
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Old 09-24-2008, 03:25 PM   #2
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Those things can only help efficiency, but i think its normal MPG considering its auto, a heavy cab, with heavy 19's
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Old 09-25-2008, 02:15 AM   #3
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Reasonable mileage. You lose some efficiency through the torque converter and extra drivetrain loss of an automatic, the extra weight of the folding top and extra frame stiffening hurt mileage a little, as do heavier larger diameter wheels as Brendan all mentioned.

Keeping your car in good working order isn't too expensive and is worth a few mpg more. Probably making up for the maintenance with gas prices in the UK.

The OEM paper air filters (the best) last between 15,000 and 30,000 miles depending on the dust and other particulate matter in the air. Fuel filters usually are good for 60,000 miles. Depending on what type of spark plugs you have, they should last between 30,000 and 60,000 miles, probably a bit longer if you have the more expensive 4 prong types. Oil is best changed every 7500 miles, oil filter is changed along with it. Try to use an oil with BMW approval as this is the best for protection and mileage. And lastly, make sure your thermostat is in working order. I think average lifespan of these is like 60,000 miles. When they slowly fail, you don't always get any messages, but they fail in the partway open position prolonging warm up times, which causes your engine to use more gas.

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Old 10-04-2008, 06:03 PM   #4
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hi ben

ive got a 2003 e46 330ci auto and i only get around 20mpg if driving normal and i do mostly urban. on a run it goes to around 30mpg and if driven hard then it drops to 15mpg hope this helps.

forgot to mention its totally standard
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