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View Poll Results: Why don't you have a MPG readout?
Can't aford one at this time. 22 50.00%
My car is to old. 16 36.36%
I'm not sure where to get one. 5 11.36%
A gadgit isn't going to improve my driving. 1 2.27%
I don't buy stuff off the internets. 0 0%
I didn't realize they were an option! am ordering one right now. 0 0%
Waiting for MPG version of SuperMID 0 0%
Voters: 44. You may not vote on this poll

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Old 12-29-2008, 11:06 AM   #31 (permalink)
captainslug's Avatar
Join Date: Sep 2008
Location: Sterling, VA
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BORK! - '89 Volvo 240 DL Wagon
90 day: 21.27 mpg (US)
Thanks: 2
Thanked 24 Times in 13 Posts
Because I don't have a car.
My fuel efficiency is phenomenal!

Last edited by captainslug; 12-29-2008 at 11:32 AM..
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Old 12-29-2008, 01:25 PM   #32 (permalink)
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Originally Posted by Ryland View Post
I'm pretty sure that the dual fuel injector set up is mostly a "cold start" injector and a "normal" one, the cold start one is used instead of a choke to allow a simpler control set up of the engine, some MPFI systems used a 5th injector like this as well, as seen on older Toyota's.
Not just a cold start injector... it's an auxiliary injector. Hooking it up to my dwell meter it's always on. In fact it is the injector that keeps the car running during idle while the main injector shuts off.

Originally Posted by MetroMPG View Post
Or, assuming both injectors operate at stoich, you could make an instrument that extrapolates MPG based on air flow like the ScanGauge does.
Any ideas on how to measure airflow?

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