I've just started using Howe's diesel treatment and have been getting it from the local truck stops. I think the mileage has improved some but won't say for sure until I burn a few more tanks full with average driving.

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1983 300-D turbo
1985 300-D turbo
1959 Harley Panhead chopper
1929 Ford coupe restored
I hang out with Boneheaddoctor at Schuman Automotive OBK#5
All liberals are mattoids but not all mattoids are liberal.