I had a 99 S-10 ZR-2 ext cab... factory with 31x10.50r15 tires and taller/wider suspension that the standard S-10/Sonoma's
Had the 4.3 and the best tank I ever got was 20 mpg though 16 was the norm (Heavy foot)
It was one of my favorite vehicles I ever owned.... If you get a 4x4 relace the input seals in the transfer case... common issue where the transmission leaks into the t-case and overflows into the vacuum system destroying the 4x4 font axle servo and the HVAC controls and also the transmission from low fluid
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