Muffler (silver) and exhaust pipe on a Ducati 695 motorcycle. A muffler (silencer in English) is a device for reducing the amount of noise emitted by the exhaust of an internal combustion engine.
Quick Answer. Normal blood sugar levels should be  less than 100 mg/dL when fasting and less than 140 mg/dL two hours after eating, according to WebMD. People without diabetes tend to have blood sugar levels of around 60 to 90 mg/dL before eating.
The American Diabetes Association recommends normal or near-normal blood sugar levels, and defines âtight controlâ as: 1) pre-meal and fasting glucose levels of 70â130 mg/dl (3.89â7.22 mmol/l) 2) sugars under 180 mg/dl (10.00 mmol/l) two hours after start of a meal. 3) hemoglobin A1c under 7%. A hemoglobin A1c of 7% is equivalent to average blood sugar levels of 160 mg/dl (8.89 mmol/l).