Fuel Economy instrumentation - do you use it?

[krousdb]

I have a Magellen Explorist 400. Most GPS's have elevation. You can find the Explorist on ebay for under $100.

[Nden]

I don't have any FE installed yet. I do have a used Apexi Vafc which allows 8 or 16pt fuel adjustment +- (its the old Vaft, precursor to the NEO which is approx $400). i'd like to connect the Vafc and a good AFR gauge (on another thread). hmm i think a seperate toy- apexi auto timer has battery voltage readout on it come to think of it. How does a Vacuum gage or Voltmeter help with fuel efficiency?

[mopo3]

I don't currently use FE instrumentation but I do use a GPS to calculate my miles, max speed, ave moving speed, time stopped. I'm still new to hymermilling (3 tanks) but my last one was 37MPG which means ((37-28)/28)*100 = 32% I think I'll get a vacuum gauge.