I had the option of purchasing 2 different 87 classics last summer. The first had the 6V92 engine and the second an 8V92. I chose the 6V92 for the same reason the original owner selected it and that is fuel mileage. I have been pleasantly surprised. The previous owner had touted a 10 mile per gallon performance, although I did not believe him.
Turns out that driving 75 most of the time, I get 9.5 mpg. (and I diligently keep records on purchases.) That is incredible for a 38,000 pd coach. I also intend to begin adding a fuel additive this spring which suggests that mileage will be even better.
The second reason for choosing my coach was the roof airs. The 8V92 alternative had an air conditioner in the engine compartment which the previous owner indicated would be very costly to maintain. I guess much of it is in the way of working on the engine and must be removed.
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