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Hi
quick update on mpg % increase. from first tank which was 13 mpg (summer) now up to 19mpg (winter). This is almost 50% increase ??? Think a rear diffuser will pay divdends as reserach shows it helps to fill low pressure area left by vehicles. will take it from rear most edge of rear bumper curve it around water tank and up to floor above rear axle. exhuast measurements on diameter front to rear show at least 3 different diameters. narrowest is over axle with 1.5 inches outside on a crushed bend so internally more like 1 1/4 inches to 2 1/4 inches. best diameter for system is 2 1/4 inches so my engine is being sufforgated by exhaust. also this diameter has been quoted on several websites for toyotas as giving a 20% improvement in mpg. hopefully sort exhaust and tidy back up aerodyamically should see a consistant 20mpg +.
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