Simple ways you increase your gas mileage thread.

[Emre]

Besides driving more conservatively, you can do the following:

(1) Tune up. That includes new cap & rotor, fresh plugs with correct gaps, rebuilt or new injectors, new O2 sensor, new air and fuel filters, and a valve timing adjustment.

(2) Fresh oil. Change the oil in the crankcase, tranny, and rear diff. You can also try using a thinner grade of oil and/or a true synthetic oil (Group IV or V base stock) for reduced frictional losses.

(3) Tires. Keep them properly inflated at all times. Switch to narrower rubber. Consider low rolling-resistance tires.

(4) Brake less. Each time you brake, you then have to use the throttle to bring your momentum back up. There was an article in GRM a few months ago about a guy who was doing a "hypermiling" competition in an old Honda CRX. He swapped in a full-race suspension on his Honda so that he wouldn't have to slow as much for corners.

(5) Use low-octane fuel. Your car probably does NOT need anything over 91 octane. From a fuel-efficiency standpoint, there is an advantage to using the lowest octane fuel that will run safely in your engine. A stock E21 320is should run fine on 87 octane without knocking.

[djjerme]

(6) Ride a bike.

[TurboJake]

E30's get their best mileage when they won't start and need to be pushed.

Joking aside though, driving habits make the biggest differences. Push clutch in while going downhill (Less revs, less injector pulses, less fuel). Use less throttle. Run an economy tune.
The miller MAF introduced an extra 2 or so MPG all around for me. Pretty nifty. Wasn't expecting that at all.

And what everyone else said.

[10Toes]

E30's get their best mileage when they won't start and need to be pushed.

Joking aside though, driving habits make the biggest differences. Push clutch in while going downhill (Less revs, less injector pulses, less fuel). Use less throttle. Run an economy tune.
The miller MAF introduced an extra 2 or so MPG all around for me. Pretty nifty. Wasn't expecting that at all.

And what everyone else said.

This is wrong, your fuel injectors are off (not injecting any fuel) if the wheels are turning the crank (such as going down a hill), so it uses more fuel to idle with the clutch in.

[dannyyisntt]

(6) Ride a bike.

(7) Walk.

[Stephen]

1. Drive hard
2.Get shit mileage
3. Get slammed by speeding ticket
4. Begin driving like granny
5. Reap improved mileage

[tom d]

(Less revs, less injector pulses, less fuel).

K-jetronic also know as CIS does not pulse. K is short for german 'Kontinuierlich' and CSI means Continuous Injection System. the engine once started, will run the jets open and are constantly injecting fuel.

[Jaxx_]

K-jetronic also know as CIS does not pulse. K is short for german 'Kontinuierlich' and CSI means Continuous Injection System. the engine once started, will run the jets open and are constantly injecting fuel.

most cars on this forum won't be running stone age technology. They're at least to the industrial revolution... motronic 1.

[Emre]

most cars on this forum won't be running stone age technology. They're at least to the industrial revolution... motronic 1.

The OP says he's running an E21, so I'm guessing he's got K-Jet.

[5Toes]

Changed my tire pressure cause of this thread... front had 27 one side (I had notcied it was low last week) and 29.5 the other.
Rear was 28.5 both sides.

Now I got 30 out back and 32 up front :P

[Pantless Spency]

The OP says he's running an E21, so I'm guessing he's got K-Jet.

yarp dis for my e21 teh DD not teh in pieces e tirty

[AndrewBird]

I read somewhere that it is actually more fuel efficient to accelerate harder/faster then slowly/gently as you move up to a higher gear faster then you would accelerating slowly, thus using less fuel due to driving at a lower RPM sooner.

At least that's the excuse I give myself for romping on it.

[tjmonsen5]

I tried driving like a granny for a full tank of gas to see if mileage would improve. I found that mileage DECREASED! Couldnt believe it. The engine must be working too hard under 2.5k rpm. I always shift above 2.5-3k rpm now, and maintain a steady 23-25mpg in my 325is.

[Pantless Spency]

i bought new windshield wipers, tried to get the super fancy arched ones with aero for the better mileage, but the people at derp auto zone were convinced they wouldn't work on my car, so i settled for the less advanced ones and some rain x.

[lambo]

In Colorado where I was driving 55mph more often I was reaping around 26mpg but here in NM where the speed limits rarely reach 40 I am getting 18mpg FFFFUUUUUUUUUUUU