Hi Coyote X
Welcome aboard. Great looking van I must say. If you can get the front end checked for alignment, that would be another area that drops gas mileage when it's out. Full synthetic "may" be a bit to much for an engine that has high miles on it. I developed seal leaks when I went full synthetic. I now run 50/50 in my motor and transmission, no more leaks. Full synthetic in the rear end though (it's been replaced). Take Care.
Welcome aboard. Great looking van I must say. If you can get the front end checked for alignment, that would be another area that drops gas mileage when it's out. Full synthetic "may" be a bit to much for an engine that has high miles on it. I developed seal leaks when I went full synthetic. I now run 50/50 in my motor and transmission, no more leaks. Full synthetic in the rear end though (it's been replaced). Take Care.