Couple of questions

[pearsonrb]

I have a Gryphon CS in a 2010 F150, 4.6 3V 6 speed auto Supercab w 3.73 limted slip rear end. I'm running on Level 2 - Tow.

1. I replaced the stock 275 65 18 tires with 275 70 18's and keyed in the new size on the programmer. When my truck speedometer reads 68 mph, the Gryphon displays 65. All the tire calculators I've use on the internet say that it should be the other way around, that when the CS says 65 I should see 62-63 on the speedo. Which is right?

2. I was looking at my invoice, and it describes my programmer as having Economy, Tow and C 87 P tunes. But the unit actually shows Trans Only, Towing and Extreme as the tunes. Why is there a difference? (No Economy tune)

Thanks in advance for any help.