My 8 valve compressor were 195 to 210 compression.
before you do anything. I believe tire on mine were perfect. I think it was 235/75/15
Engine block and head are alum so they do HAVE BIGGEST IMPACT on gas economy in winter. It have hard time stay WARM. I got 18 mpg in -15oF to 30oF in 10-30 miles commute. By way DON"T BUY aftermarket thermostat they make worse. Never warm up 100% full. Get OEM Thermostat from Suzuki dealer.
Geo or suzuki sit TOO high. I believe you could get 1-2 mpg if lower about 2-4" if You can do.
Have you change timing belt on 16V yet? DO IT. Don't get CHINA timing belt they kill your engine.
Now I am try get suzuki sidekick SPORT because they have 1.8L with timing chain instead belt.
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