Half a croissant, on a plate, with a sign in front of it saying '50c'
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speedometer/airspeed gauge

Shows both speed over ground and speed through air
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While driving in clear air(no immediate traffic around to give false airspeed, not unsmoggy), different readings indicate more or less air induced drag. Driver can opt to change speed to get better or worse gas mileage. All the electronic contraptions could get involved with the readings from the two gauges but this idea only pertains to the goings on in driver's head.
cudgel, Jan 23 2015

Handlebar_20pitot [pocmloc, Jan 24 2015]

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       I assume you're looking for indicated airspeed rather than true air speed. IAS is more closely related to drag.
scad mientist, Jan 23 2015
  

       If the driver notes that the airspeed indicated matches the ground speed indicated on a known calm day he can then judge when the readings differ under other wind conditions. Trial and error will tell him what gas mileage he gets at what airspeed indicated and he can decide to drive at the airspeed that returns the gas mileage he wants. In some instances people don't realize that a headwind is costing them money at their normal speed and slowing down a certain amount will get them back to their usual mileage. Could all be done with computers and cruise control, of course. This is just a simple combined dual reading gauge. Yes, indicated air speed. Analog, naturally.
cudgel, Jan 24 2015
  

       Used car sales guy: "I admit that probe thingy breaks the streamlining. How bout I knock fifty off the price and give you a couple free floor mats ?"
popbottle, Jan 24 2015
  

       Nice.   

       Croissant awarded if the instruments are calibrated in knots.
8th of 7, Jan 24 2015
  

       [8th] Sorry not to have mentioned that gauge dials available in mph mps yps fps km/h km/s m/s kn ma c
cudgel, Jan 24 2015
  

       [+]
8th of 7, Jan 24 2015
  

       If there's a cross wind, a mechanism to angle all four wheels would allow the car to crab, and reduce effective CSA.
Ling, Jan 24 2015
  

       An African swallow, or a European swallow ?
8th of 7, Jan 24 2015
  

       //angle all four wheels would allow the car to crab// like a '90s Honda Prelude.
pocmloc, Jan 24 2015
  

       //like a '90s Honda Prelude//   

       New Benzes will tilt slightly into the crosswind to track straight.
DIYMatt, Jan 27 2015
  

       If you get a few more gauges and probe thingies, will I be able to get a more advanced driving license... I'd like and instrument rating.
bs0u0155, Jan 27 2015
  

       Drive the northern end of the M23 on a Friday night and you don't just get an Instrument rating, you get an campaign medal ...
8th of 7, Jan 27 2015
  

       heh, I give you the weird off-camber right hand kink in the M53. You won't have driven it, the only point in the M53 was to get to my brother's house, he's moved now.
bs0u0155, Jan 27 2015
  

       // new Benzes will tilt slightly into the crosswind to track straight// B-52's can operate in a 43 knot crosswind by crab steering the main landing gear up to 20 degrees.
cudgel, Jan 27 2015
  

       // the only point in the M53 was to get to my brother's house //   

       For you, maybe. For the rest of the population, the only point in the M53 was to get away from your brother's house.   

       We'll see your M53 and raise you the Northbound slip road onto the M6 at Junction 15 (Trentham). Very like life in the 18th century; nasty, bruitish and short.
8th of 7, Jan 27 2015
  

       What about the one in Scotland that joins the fast lane?
bs0u0155, Jan 28 2015
  
      
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