I have an '88 C1500 5.7L Silverado with 7747 ECM and 27FS512 chip in a ZIF socket and Moates Burn2, using TunerPro RT. I've been building it for a while and am in the process of tuning with the help of Dave w (thanks so much Dave). I'm thinking my next step would be Highway Lean Cruise for better mileage (currently getting ~14MPG), I live out in BFE, AZ where the closest Lowe's or auto parts store is 18 miles and I-10 speed limit is 75MPH (normally do ~80).

My questions are;
What kind of benefits has anyone gotten with this patch in MPH gained and/or, any issues (like meltdowns etc.)?
When I'm cruising @ 80MPH my MAP is ~51kPa where max for HLC is 37.29 in the Scalars table, Has anyone tried raising the max or am I gonna have to take the back roads (closer to 47kPa @ 60MPH)?