Exhaust leak before the turbo will effect power , FUEL mileage , and exhaust brake performance.
Get to the repair as soon as possible.
Fuel mileage can vary 20% between drivers of the same vehicle .
Speed , rate of acceleration , and routes all will bring mileage down.
I consider 7 MPG a little on the low side , but you'd need input from someone with the exact same engine/trans and coach weight.
Do you tow a vehicle behind the coach?
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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