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Old 01-06-2013, 06:57 AM
KeithS KeithS is offline
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Location: Central NJ
Join Date: Dec 2001
Posts: 1,892
Mein Auto: '11 335d, '17 340iGT
Originally Posted by badgerbob View Post
Has anyone noticed if the tire pressures affect gas mileage on this vehicle? I get pretty much right on 36-37 mpg on the highway, but see some getting 40 mpg plus. Other than speed I am wondering what others have found that may influence mpg.
MANY factors impact MPG
  • Size of tires - bigger tires use more fuel
  • Tire Presssue - more pressure improves MPG but deteroriates ride quality
  • Software version in the DME
  • Ambient Temperature
  • AC use
  • How heavy your right foot is (accelerating faster vs slower)

But acutally I'm not sure about the last one. I have a feeling that with the D if you accelerate up to speed quickly then get into cruise/maintain speed mode sooner, that it uses less fuel than accelerating very slowly delaying getting into the maintain speed mode.
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