Im getting awesome mileage on my 95sc previa, 160k miles. Its running with 5w-30 oil, and has 4oz of tufoil additive, its also added in the diff oil. Ive got a 2nd prev sc a 96 which has better compression, but tested lower mileage at 23hwy. I beleive this 95 has had near 30mpg, believe it or not. I have verified 27.3 mpg from fillups, and achieved it with 2 adults and 5 kids in the van, and I wasnt trying that hard. Im relying on my scangauge2, but Ive had some hwy trips register 35mpg. But I think the AVG (average) mileage reading on the scangauge is not the true mileage, its a rolling average. Also this van has slightly low compression, @ 120psi across the 4 cyls. And uses a little more oil than usual. Even though its been looked after from new.
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