Re: 5.3 .... whats your best MPG
all my 99-07 trucks i have owned 4.8 or 5.3 average 15 mpg in city and 18-19 on the hwy.
Owned an 07 Tahoe that averaged 12-15 max.
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Bruce
1964 C10 SWB #Junk
1979 C10 utility #cargopants (sold)
1971 GMC Sprint (sold)
1974 GMC Grande Sierra (sold)
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