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so a couple of weeks ago I took the forums advice and started burning prem. in my truck. 03 silverado 8.1. so my commute is about 5-7 min. at 35 mph. my computer avg. mpg has dropped about 2 mpg since I started this short drive. when i,m driving it shows my instant avg is 6-8 mpg which seems odd given the low speeds. anyone help me clarify this, is the computer correct, or is the data gathered effecting the outcome. dosen't matter much since my fuel bill is now $25 a week.
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