Ok so your saying bump the timing up on the 93 tune setting? or bump 87 tow tune and try that . Im guessing you mean the 93 tune ( level 3 ) i can drive with the 93 tune around town? or is it more for highway ? I live in nc (charlotte area) and yes i notice a huge difference with different gas ,I only buy shell or bp but mostly shell get way better mpg on shell. will it do harm with 93octane on 87 tow tune ? thanks for the info Shawn
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