Thanks for this comparison...I've had the TSD card for a few months now and cannot believe how much we have saved. Having just seen this other TCS card advertised by FMCA, I was curious how they compare and you have answered that question! So far, I have been able to save between $25 and 30 per fillup of our 100gal tank, using the phone app to plot my next stop for fuel. I am wondering how the phone apps compare, from your experience...