Hi Ed
hope i can answere your questions.
1. changing the lift from .200 to .300 knocks off 3mph at 313mph. I came up with .200 after reading published reports of lift on passenger cars .300-.400. We have a spoiler and lots of weight on the rear.
2.tire slip. Yes you can input 1-15 1 is dry asphault 5 is best salt 15 is worse salt.
Narrow tires,low gearing,loose salt,to much power will show up as in the acceleration column.
3.11 means loose salt
4. Density-Altitude -temp can be inputted in the general data section,but they don't want you to change the barometer.
5.You can change the tire width but only down to 7.5" up to 15" "one problem with program" as a lot of cars have less. No input for wheelbase.
Overall were happy with the program when we went 288 it was amazing how close the speeds were from mile to mile they just happened futher down course. The gear ratio inputs are great being able to see the rpm drop and mph.
Hopes this helps JL222
Wear did those lines come from?