Are you driving slower to save on fuel costs ?

God yes, amongst other things. Please do not switch your engine off when in motion, it's beyond moronic!

Some tips;

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Do not use quick accelerations or brake heavily: This reduces fuel economy by as much as 33 percent at motorway speeds and 5 percent around town.

Do not idle excessively.

Do not drive at higher speeds: This increases aerodynamic drag (wind resistance) and mechanical friction which reduces fuel economy.

Cold weather and frequent short trips reduce fuel economy, since your engine doesn't operate efficiently until it is warmed up. In colder weather, it takes longer for your engine to warm, and on short trips, your vehicle operates a smaller percentage of time at the desired temperature. Note: Letting your car idle to warm-up doesn't help your fuel economy, it actually uses more fuel and creates more pollution. Drive to your furthest destination first and then as you are heading home, stop at the closer destinations in order from furthest to closest as the car is warmed up for longer portions of your drive.

Remove Cargo or cargo racks.

Do not tow unless absolutely necessary: Towing a trailer or carrying excessive weight does decrease fuel economy.

Minimize running mechanical and electrical accessories: Running mechanical and electrical accessories (e.g., air conditioner) decreases fuel economy. Operating the air conditioner on "Max" can reduce MPG by roughly 5-25% compared to not using it.

Avoid driving on hilly or mountainous terrain if possible: Driving hilly or mountainous terrain or on unpaved roads reduces fuel economy most of the time.

Do not use 4-wheel drive if it is not needed. 4-Wheel drive reduces fuel economy. Four-wheel drive vehicles are tested in 2-wheel drive. Engaging all four wheels makes the engine work harder and increases crankcase losses.

Maintain your Automobile: A poorly tuned engine burns more fuel, so fuel economy will suffer if it is not in tune. Improperly aligned or under inflated tires can lower fuel economy, as can a dirty air filter or brake drag.

Inherent Variations in Vehicles: Small variations in the way vehicles are manufactured and assembled can cause MPG variations among vehicles of the same make and model.

Engine Break-In: New vehicles will not obtain their optimal fuel economy until the engine has broken in. This may take 3-5 thousand miles.

I don't drive slower, I drive smoother. Avoid fast starts and sudden stops. I try to let my car "glide" more by keeping my foot off the pedals.

Yes and i have a diesel that gives 50 mpg on a run. But to thank me for that the poxy government will charge me an extra £50 road tax next year!!

No, but I have been taking off slower and I'm amazed at how much further my gas goes.

Not really, but I am using the bus on alternate days to get to work. This not only saves me money but gives me more exercise and prevents wear & tear on my car.

i started driving faster to spend less time on the road hence less fuel used

I tried driving slower, but it didn't help my mileage at all, so I went back to my normal driving (quick acceleration, 75MPH on the highway)

Yes.Speed limit has saved me almost $20 a week.

Apparently 56mph is the most economic speed to travel at.

No, I still have a lead foot.