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Discussion Starter · #1 ·
Received my LMS tuner in the mail this week. Got the 87 and 91 performance and tow programs.
First time tuner. Little worried about messing something up.
How long does it take to load program into truck?
What happens to factory program? Stored in LMS unit?
Ran 87 gas for first 4-5 tanks from new. Switched to 91 non-ethanol. Last fill up put in 86L for 741km. It has got better mileage on 91 gas.
Which program should I try first? 91 perf or tow?
 
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