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Old 03-08-2014, 10:26 AM   #57 (permalink)
Master EcoModder
Join Date: Feb 2009
Location: France - Paris
Posts: 762

la_voiture_de_courses - '03 Renault Megane Estate
90 day: 44.34 mpg (US)

xiao lan - '01 Audi A2
90 day: 38.88 mpg (US)

Brit iron - '92 Mini Mini
90 day: 45.5 mpg (US)

Prius - '09 Toyota PRIUS Lounge
90 day: 47.37 mpg (US)

Beemer - '06 BMW F800 ST
90 day: 53.06 mpg (US)
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Originally Posted by chefdave View Post
exhuast measurements on diameter front to rear show at least 3 different diameterbecausesthe . 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 +.
Congratulations on the good work

If your exhaust is a funky shape and variations of diameter, you'd better consider alternative routing because the current routing will probably not work with a bigger constant diameter : your motor home engineers did not waste time and money for the fun of pissing of owners ...
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